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post #2 of (permalink) Old 05-11-2011, 05:09 AM
turrican9
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Reviews/Unboxing

ASUS P8P67

Warning: Spoiler! (Click to show)

ASUS P8P67 PRO

Warning: Spoiler! (Click to show)

ASUS P8P67 EVO

Warning: Spoiler! (Click to show)

ASUS P8Z68-V PRO

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Newegg TV: ASUS Sandy Bridge P67 H67 1155 Mainstream Motherboard Lineup
Newegg TV: ASUS Z68 1155 Motherboards
Newegg TV: Sandy Bridge Overclocking & UEFI Demo on ASUS P8P67 P67 1155



Wanna take bios snapshots? Use a USB stick and hit F12 when in the bios!


Various Info/Issues About The ASUS P8P67 Series

Here is some interesting information posted by munaim1 about C3/C6 states and their relation to SATA performance. Especially with Sandforce SSD's. I'll just link to his post. Link


Here are some important information. Thanks to munaim1 for pointing me to this

Quote:
Originally Posted by munaim1;13469291 
I think you should add this to the op. Handy peiece of info from my thread biggrin.gif
IMPORTANT INFO FOR ASUS P67 MOBO USERS

The member quoted below killed his sb chip through a bug in Asus's bios. It is apparent that switching between profiles mainly offset and manual) the voltage does somewhat get altered. As pointed out, this bug is very dangerous and I do always recommend checking settings before applying but nevertheless this bug should be a top priority for asus.



Here is the link to the actual thread. LINK
Quote:
Originally Posted by grunion;13377004 
When swapping between profiles the offset voltage changes to .975

So 1.24v+.975v=2.215v

Happened to catch it last night before I saved and exited my 5ghz +.105 offset, the offset was actually at +.975v.
Had I not checked...

So be careful and always double check the offset when switching saved profiles.

MY OWN EXPERIENCE WITH THIS BUG !!




ASUS P8P67 series Double POST at Cold Boot Fix

Quote:
Originally Posted by [email protected];4712067 
Some of you may have been experiencing a double POST on your P8P67 series motherboard whereupon after powering on the system from a cold boot, the board will power on and then immediately reset itself before it actually POSTs and shows any display on the screen. I’ll explain the fix below and give some information about why this happens.

First, I would like to stress the importance of flashing the BIOS to the latest BIOS revision as listed on our support website, http://support.asus.com/download. You can access the ASUS EZ Flash tool from within the UEFI (advanced options, tools) to flash the BIOS from any removable device such as a USB flash drive.
From time to time we needed to implement full resets in order to maintain stability due to the architecture of the Sandy Bridge platform. For instance, the system may require one full reset when the PCH power has been cut during S5 power state. To fix the most common additional reset (double POST when powering on from off state), enter UEFI BIOS -> go to ‘Advanced’ tab -> go down to ‘APM’, press Enter -> enable the “Power on by PCIe.” function. Then press F10 to save & exit. After save & exit, let the system boot into Windows or other OS, then perform a proper shutdown: Start button -> Shut down. You will no longer have the double POST. We will fix this in an upcoming BIOS release.


Another possible solution for the Coldboot problem. Quoted from this thread.

Quote:
Originally Posted by sockpirate;12774503 
Was having a problem with cold boots, would power of and on and off and on then finally post. I was almost positive it was my power supply because the same thing happened with my UD7 low and behold it was the setting highlighted by the cursor below.

Internal PLL Over-Voltage-Disabled , no more cold boot problems !!!

I am stressing this right now!!! If you are having cold boot up problems with system looping on and off, disable this and it will more than likely solve your problem, although it is sometimes needed for high 48+ multi clocks!

imag0065g.jpg


Do you have wakeup from sleep/hibernate problems? Try to disable Internal PLL Overvoltage! (Beware, you may need it enabled in order to boot Windows at those higher multipliers. 46x +..)


The JMicron/Marvell and CPU Fan Error issues and how to resolve


Slow boot because of the Marvell (Which controls the two Navy Blue SATA connectors topmost on the board) controller detects no harddrive and loops you back to the main screen, and then back to the Marvell screen yet again? If you don't use it you can disable it in bios. Same goes for the JMicron controller which handles the E-Sata at the back of the board.

Here is a screen to where you disable these:
P8P67_PRO_109.jpg


Have a CPU Fan Error on startup, even though you've plugged the fan to the connector and the fan is spinning? Well, may be due to low RPM when booting. You could try to lower the 'CPU FAN Speed Low Limit' from bios. You can also choose to ignore the CPU FAN RPM.

Here is a screenshot to where in the bios you do this:

P8P67_PRO_113.jpg

 

 

 

 

 

 

 

 

**Overclocking**

Always backup your system partition before you go crazy on the overclocking!

Here is a link to free Imaging/Backup Software - Free Hard Disk and Partition Imaging and Backup Software. Also a free Edition of Western Digital - Acronis True Image Here.


A few Words about Offset Vcore.

Me and others have seen that when using Offset instead of manually typing in the Vcore, you get a more stable Vcore - Vcore will fluctuate less VS manual Vcore. This again can contribute to a somewhat lower Vcore needed for a certain clock frequency VS manual Vcore setting.

When you put volt values in the Offset field, you add the Vcore you type in there, to the VID of your CPU. However, the VID will vary between each different CPU, and also the speed you run it at.

My 2500K has 1.2410v VID when at 3.3GHz stock. This VID changes to 1.3410 when I overclock it to 4.5GHz. When I type in + 0.020 Volts for Offset, it will then give me 1.3410v + 0.020v = 1.3610v under load. This was tested with LLC at Ultra high. My real Live Prime 95 Blend Vcore varied between 1.360v - 1.376v. And for the most part was about ~1.368v.

If you are stable at full load, like Prime95 while using Offset, but get BSOD's when Idle/light load it is probably because the CPU Vcore ramps down on different load.

This usually happens at higher overclocks when using Offset. For me it works perfectly to use Offset at 4.5GHz with no BSOD's. But if you get problems on higher overclocks, you can try one of two things:


  • Try disabling C3/C6 states. This will hinder the CPU in ramping down the Vcore (as much?) when at idle/light load with Offset Vcore. (Will try this myself. Got a report it helped stability.) Update! I have been using C3/C6 disabled for a long time now. Turns out these can cause idle BSOD's or freezing if they are at AUTO or ENABLED when overclocking. Me and others have confirmed it is best to leave these two Disabled when overclocking.

    Beware though, that when disabling both C3 and C6 the Turbo Ratio: By Per Core function in bios will no longer work.

    Also another update, which have been posted in the first post of this Club for a while now, there have been reports when disabling C3/C6 stats can infact loose harddrive/SSD peformance. Especially SATA3 SSD's and Sandforce based SSD's. I have not experienced any performance loss with my Intel X-25 Gen.1 and Gen.2 SSD's when disabling C3/C6 stats.

    Here is a quote from the post I made earlier:

    Quote:
    Here is some interesting information posted by munaim1 about C3/C6 states and their relation to SATA performance. Especially with Sandforce SSD's. I'll just link to his post. Link
  • Instead use High LLC. This way you can have C3/C6 at Auto because High LLC will give you a higher Idle Vcore. Just compensate by using a Higher Offset Value to get about the same Load Vcore VS Ultra High LLC. This is probably the best solution.
     
  • Use manual Vcore setting instead of Offset.




Some very interesting info. (Testing this myself!)

Quote:
Originally Posted by eduardmc;12411669 
Be patient with me since english is not my native language.

So far i have been able to lower my voltage from 1.520v to 1.456v stable @ 5.1ghz. how did i do it?

i got my sandy bridge on release day and have been overclocking, trying to find out a stable highest clock with lowest voltage. People might think that it is easy but is not cause is to much time consuming. You are never satisfy with your speed cause you want you reach a new safe limit of it.

after trying so many thing and having a good batch (i know it doesnt matter much) i couldn't understand why everyone was beatting my voltage.

The problem lies in the RAM and VCCIO voltage. Sandy bridge overclocking seems to be afected by ram (size and overclocking) and VCCIO volage somehow. i see that must overclocker can achive higher core/lower voltage with only 4gb (2x2gb) while people with (2x4gb) can also reach it but with higher voltage (core voltage).

i started tweaking with all voltage. i spend 2 entire days doing this, enabling and disabling, prime95 and all. I found out that if you have 8gb and overclocking your ram is limiting to have a stable overclock with lower voltage and you might think is the CPU fault.

After working with all the voltage my motherboard has to offer, i went back to VCCIO voltage (every other voltage on auto) and notice that if i decreased it my overclocking at same VCORE would become instable (0.800v). BUT increasing VCCIO BECAME STABLE AT LOWER VCORE. i was able to decrease my vcore from 1.520v to 1.456v by increasing VCCIO voltage to 1.18V. Do not go overboard on VCCIO voltage and try to maintain 1.2v or lower.

Before my pc would not boot 5.1ghz with 1.48V and now i'm prime95 4 hours stable with 1.456v. I even think that i can go even lower.

Please do not bash my post just trying to help because that is why we are here right...

Source!



Monitoring/CPU-ID and Stability Testing Software Links

Monitoring/CPU-ID




Stability Testing Software


Prime 95 Home (Blend test highly recommended for Sandybridge)
IBT Home (Latest version Home)
OCCT Home




TwoCables template for his stable Core i5 [email protected] overclock

Quote:
Originally Posted by TwoCables;14344733 

Ai Tweaker
  • Ai Overclock Tuner: Manual
  • BLCK/PCIE Frequency: 100.0
  • Turbo Ratio: By All Cores
  • By All Cores: 48
  • Internal PLL Voltage: Disabled
  • Memory Frequency: use the rated speed for your memory
  • DRAM Timing Control: use the rated timings for your memory
  • EPU Power Saving MODE: Disabled


Ai Tweaker\ CPU Power Management >
  • CPU Ratio: Auto
  • Enhanced Intel SpeedStep Technology: Enabled
  • Turbo Mode: Enabled
  • Long Duration Power Limit: Auto
  • Long Duration Maintained: Auto
  • Short Duration Power Limit: Auto
  • Additional Turbo Voltage: Auto
  • Primary Plane Current Limit: Auto


Ai Tweaker (in the DIGI+ VRM section)
  • Load-Line Calibration: Ultra High
  • VRM Frequency: Manual
  • VRM Fixed Frequency Mode: 350
  • Phase Control: Extreme
  • Duty Control: Extreme
  • CPU Current Capability: 140%
  • CPU Voltage: Offset Mode
  • Offset Mode Sign: +
  • CPU Offset Voltage: 0.040V
  • DRAM Voltage: use the rated voltage for your memory
  • VCCSA Voltage: Auto
  • VCCIO Voltage: Auto
  • CPU PLL Voltage: Auto
  • PCH Voltage: Auto
  • CPU Spread Spectrum: Enabled


Advanced\ CPU Configuration >
  • CPU Ratio: Auto
  • Intel Adaptive Thermal Monitor: Enabled
  • Active Processor Cores: All
  • Limit CPUID Maximum: Disabled
  • Execute Disable Bit: Enabled
  • Intel Virtualization Technology: Disabled
  • Enhanced Intel SpeedStep Technology: Enabled
  • Turbo Mode: Enabled
  • CPU C1E: Enabled
  • CPU C3 Report: Disabled
  • CPU C6 Report: Disabled



Note: that Offset Voltage gets me a Core Voltage in CPU-Z of about 1.384V - 1.392V while under full load in Prime95's Blend. So be cautious and adjust accordingly.

 



 

Official ASUS P8P67 Series Overclocking Guide and Information

Quoted from a great thread on HardOCP by Juan_Jose

 

Quote:

Originally Posted by Juan_Jose;4710466 
Hello One Hello All,

It has been alittle time since the launch and the retail availbility of Intel new Sandy Bridge CPUs ( especially K parts ) as well as their corresponding P67 Motherboards.

We at ASUS would like to first and foremost thank all the users who have once again trusted in ASUS and purchased one of our P8P67 Series of motherboards. We have worked quite hard to ensure a quality range of boards with a quality bios are ready at the time of launch.

With that noted there are alot of changes that users are going to need to be aware of. As such I am releasing this information in hope users will know how to best use their boards and new UEFI options. Hopefully this guide will provide a solid detailing of many of the new aspects users are interested should there be additional questions, concerns or inqueries please let me know and i will do my best to reply.


Lastly as always ASUS holds no liability for any damage you or your hardware may incur during the pursuits of overclocking.
Warning: Spoiler! (Click to show)
I have detailed our recommendations to maximize the overclocking potential / scaling on ASUS’ P67 series of motherboards. This Guide has been developed after extensive internal testing across multiple boards, multiple bios builds and a high sampling rate of both D1 and D2 CPUs. While this guide is not a definitive article listing every possible overclocking combination, the information contained listed is providing repeatable results in our testing. Of course the quality of the cpu and cooling is very important but overall we think the results on our boards should exceed those of others at like settings.

Expectations regarding K series overclocking in general and on ASUS P67 motherboardsPrior to the recommendations on overclocking the K series, I am outlining our results to set expectations.
The results below are based on the range of the CPU turbo multiplier when overclocking.
Results are representative of 100 D2 CPUs that were binned and tested for stability under load; these results will most likely represent retail CPUs.
1.Approximately 50% of CPUs can go up to 4.4~4.5 GHz
2.Approximately 40% of CPUs can go up to 4.6~4.7 GHz
3.Approximately 10% of CPUs can go up to 4.8~5 GHz (50+ multipliers are about 2% of this group)
Additionally it is recommended to keep 「C1E」and「EIST」option enabled for the best overclock scaling. This is different than previous Intel overclocking expectations where the best scaling was with disabled power states or power management options.
Update specific to D2 and retail parts: Jan 11 2001
As always ASUS strives to be at the forefront of performance and functionality offered by a quality bios. Keeping this in mind ASUS has been actively working in conjunction with Intel to optimize overclocking potential on ASUS P8P67 motherboards and K series CPUs. With the latest bios revisions ( 1000 series ) or 600 series for ROG specific optimizations have been made to the microcode and corresponding tables that relate to D2 and retail parts. These are improvement are in addition to general improvements in all respects. Present with this new build of the UEFI is a new option. This option / value is “ Intel PPL Overvoltage” this option furthers multiplier scaling considerably.* In addition due to the increase in scaling more exotic forms of cooling cannot be used and will be needed under certain multiplier ranges and corresponding voltages. The general maximum range for the highest performing dual fan air based heastinks still remains 50x to 52x.

* Intel PPL Overvoltage ( for increased K series overclocking set to enabled )

Overall in our ongoing internal tests the maximum frequency now achievable ( under LN2 ) is 5.8GHz. At this time we do not have a compiled database to reference improvements in the overall scaling range or new % of CPUs able to hit 50+ multis. With that noted currently we are seeing generally a minimum of 2 multi to as much as 7 multi increases with this value enabled on applicable D2 and retail parts.
Example
A D2 sample with peak multiplier of 44 with PPL option enabled and corresponding voltage applied we have seen results of a stable 50 multiplier now able to post / boot and be held. ( previously without the PLL value the same CPU would failed to compelte a boot with a any multi exceeding 45 )
In addition to the increase of the multiplier range a “side effect” is additional Vcore needed to compensate for maintained post/boot and stability tests. The new voltage level do not align with standard voltage scaling ( on CPU already able to hit / sustain comparable multipliers.
Example
Generally 4.8GHz stability can be achieved at 1.400 – 1.425 Vcore now with PLL enabled D2 parts exceeding their previous max multiplier the increase in voltage would be 1.425 – 1.450.
It is important to note this option should generally only be used with D2 and retail parts NOT D1 parts. Internally we have partial results to indicate degradation of stability at previously reached multiplier values. Some internal testing has shown on limited samples that some improvement is possible (generally in the range of 1 multi possibly 2 )
In addition continued testing with the PPL option enabled and D2 or retail parts have shown some benefits to CStates being disabled when approaching, at or exceeding a 50x multiplier. An important note to keep in mind is that disabling CStates can considerably affect HD performance ( especially SATA6G ) Please keep this in mind when going for the highest level overclocks.



Expectations regarding K series overclocking implementation options on ASUS motherboards – Using Speedstep or Not Using Speedstep

Quick Note on implementation of K series Turbo Multiplier control –
While our Digi+ VRM option has extensive adjustments to voltages, multipliers and Bclk (such as .1 increments ex 106.8 or 108.1) one specific difference is noted below.
With the latest bios revision ASUS motherboards have a high level of flexibility at customizing the efficiency and consistency of the overclock values set in the UEFI.
It possible to overclock while keeping speedstep enabled and use the offset voltage method for Vcore increase this will provide the overall best in temperature and heatsink performance as well as generally efficiency and extension of the lifespan of the motherboards its components and the CPU. This is due to the Turbo Multiplier working and exucting ramping as Intel intended.
Example leaving all CStates and Speedstep enabled will allow the CPU to idle down in Vcore and frequency ( 1600MHz ) and ramp up when under load to 4.8GHz when needed.
Should there be interest in consistently maintain a desired clock frequency users can disable Speedstep and still keep Intel Turbo multiplier overclocking enabled.
•Please note that overall disabling or adjustments of Speedstep or CStates do not affect overclocking range ( this is different than previous generations when power saving states were advised to be disabled when exceeding 3.8 to 4.0GHz ).


K series overclocking benefits on different ASUS P67 motherboards

Quick Note Regarding Motherboard Stack – What does going higher in the board stack provide overclocking wise?
ASUS’ entire line of P67 motherboards features a class leading and high performance Digi+ VRM implementation that allows for superior overclocking performance; there will be differences between boards.
While our entire board lineup has been internally tested to fully support K series processors, when overclocking in multiplier ranges of 50 to 54x the higher end boards will benefit in two key categories.
1.Better Vdroop efficiency.
2.The ability to help drive and sustain a 50+ high load Overclock under maximum loads. Examples of boards that focus on this level are our Deluxe, WS, SABERTOOTH, and Maximus IV Extreme

K series overclocking multipier wall

Quick Note regarding the K series multiplier wall – Previous generations of Intel CPUs due to architectural differences had two aspects that could readily change OC scaling potential. These two factors were TDP (heat output under load) as well as core (CPU/VTT ) voltage being supplied. With previous generation cpus, improvements such as high end air cooling, water cooling or more extreme forms like LN2 in addition to extreme voltage increases could potentially provide increases in clock speeds on a continual ramp until the limits of the CPU were reached. This is not the case with K series on the P67 chipset.
In internal testing we have found that maximum multipliers in excess of 50 (up to 54) have been able to be realized with full stability under Air Cooling and with cpu vid voltages under 1.525V. In fact, the processors will actually start to downclock as they get colder with temperatures under -20C actually performing worse than the retail air cooler at times. The processors optimal range for performance is around 15~20C in our testing.
An example is noted below.
Should you have a CPU in hand that reaches a 47 multi easily ( posting/booting and running full stability tests at a set Vcore of 1.375V) you would then attempt to jump to the next multiplier. With the K series CPUs you may have reached the max multi regardless of the cooling or voltage used. Adjustments to either of these settings will not change the ability of the board and CPU to post at 48x. The only time it will continue to scale would be if the CPU in hand supports higher multipliers or can be finely tweaked to reach that next multi, in this case we suggest using the 47x multi and adjusting Bclk until you reach the limits of stability.
100BCLK + 47 Turbo Multiplier with Vcore of 1.375 and LLC ( load line calibration of ultra high = 4.7GHz
100BCLK + 48 Turbo Multiplier with Vcore of 1.400 and LLC ( load line calibration of ultra high ) = no boot
100BCLK + 48 Turbo Multiplier with Vcore of 1.425 and LLC ( load line calibration of ultra high ) = no boot
100BCLK + 48 Turbo Multiplier with Vcore of 1.450 and LLC ( load line calibration of ultra high ) = no boot
It is important to note that a post will still occur with a multi present that is at the multi wall. This is because only when the OS begins to initialize and the Turbo ratio is initialized ( kicks in and ramps up ) that Turbo Multiplier will be raised to defined multi at this point it will then cease to boot due to the multiplier wall being reached.

K series overclocking and voltage range recommendations

Quick Note regarding Voltage Scaling – Internal binning of both D1 and D2 parts we discovered consistent voltage scaling patterns.
1.For K series parts, the stock voltage supplied will allow for consistent overclocking generally up to a multiplier of 43x. There is potential for the multi to be raised to 44x depending on the load induced. This default voltage range be approx 1.240 to 1.260 under load.
2.Increased range between 44 to 47x multipliers will generally require a voltage range between 1.30 to 1.375V with an LLC recommended setting of high to ultra high.
3.Increasing the range between 48 to 50x multiplier will generally require a voltage range between 1.40 to 1.500 with a LLC recommended setting of ultra high.
4.Increased range between 50 to 52 (52 generally considered peak max multiplier except for rare 54x parts) will generally require a CPU voltage range between 1.515 to 1.535V with LLC at Ultra High and potential fine adjustments to the CPU skew range.

Overall a key item to note is the best voltage to oc scaling range potential for the turbo multiplier is 1.400 to 1.425 vcore. Using this voltage range with an LLC recommendation of ultra high will generally provide the best scaling potential with proper load temperatures*. We have generally found exceeding this voltage will not provide additional scaling or will increase load temperatures to a high level with synthetic load applications ( like Prime, Linx, OCCT ). Should you use more realistic loading testing (our recommendation is a combination of AIDA64 stress test, PC Mark Vantage) then temperatures under will be considerably under the max TDP rating.

*cooling recommendation and test performed with CoolerMaster Hyper 212+ with Single Fan, this is the minimum recommendation for multis above 46x. For 50+ multis we recommend a dual fan configuration with this cooler or improved cooling.
K series overclocking benefits from non CPU Voltage based adjustments ( UEFI values for power management , Cstates, PCH etc )

Quick note regarding bios values that should be adjusted

– Over a long test and tune cycle, ASUS has developed a class leading bios with superior auto overclocking. This superior performance translates to overclocking in two ways, manually or automatically via the use of our Auto Tuning application.
Keeping in mind that most retail K series parts will be sub 50 multi capable, our Auto Tuning application has been designed to Auto Tune up to a range of 50 should the CPU support it. In effect reaching the absolute maximum clock a user can reach manually. Additionally Auto Tuning can serve as a good option for seeing the potential in the CPU and max multiplier it may have before fine tuning the system.
An example is shown below. P8P67 (Standard) – 2600K, Hyper 212+, Corsair 1600C8 memory 4 dimm.

Should you continue with manual overclocking, these are the advised recommended values.

4.7GHz or Below
All bios values to Auto except for those noted-
CPU Turbo Multiplier
Dram Voltage to specification
Internal testing has shown Auto Values will allow for stability in all forms of testing including high synthetic high load applications (Linx, Prime95, Occt ). In the event general stability is not achieved in these synthetic high load applications, you can adjust the noted values for improved stability.
Digi + VRM options
VRM frequency to 350 – Requires setting to manual adjustment and entering the specified value.
4.7GHz and above
CPU Turbo Multiplier – To desired value
Dram Voltage to specification
Digi + VRM options
VRM Frequency change to 350 – this value will allow for scaling to 50+ multi without issues
Phase Control change to extreme – this value will allow for scaling to 50+ multi without issues
Duty Control change to extreme - this value will for scaling to 50+ multi without issues.
No other values need to be changed. Unless otherwise noted all other UEFI values used are AUTO.
K series overclocking and its affect on subsystem performance especially HD performance
Quick note regarding options that can affect subsystem performance
It is NOT advised to make adjustments to Cstates as this can considerably affect hard drive throughput performance ( especially SATA6G SSD or Sandforce 2 based SSD ). It is recommended that all CPU power configuration states be left on their default parameters. Overclocking tests have shown internally no increase in multiplier scaling when adjusting these values. * under special cases with high multi capable CPUs and synthetic high load applications ( Linx, Prime, Occt ) it may required C states to be disabled. This has generally only been confirmed for some 51-54 multi capable CPU’s.
K series overclocking benefits from adjustments to Digi+ VRM options
Advanced Digi+ VRM options recommendations
VCCSA
This has shown in internal testing not to improve overclocking, yet may still maintain the same level of stability while being lowered from its default value in order to keep the CPU cooler.
VCCIO
The adjustment of this voltage may help to slightly improve the overclocking capability of the IMC / DRAM, even though the default voltage is enough to run at a 2133MHz DRAM frequency. A 1.20v setting is more than adequate to maximize Memory overclocks in most cases.
CPU PLL
This setting did not improve overclocking, yet the user can maintain the same level of stability while lowering its default value in order to keep the CPU cooler.
PCH Voltage
This setting did not improve overclocking, yet the user can maintain the same level of stability while lowering its default value in order to keep the CPU/PCH cooler.
PCH PLL
This setting did not improve overclocking, yet the user can maintain the same level of stability while lowering its default value in order to keep the CPU/PCH cooler.
K series overclocking and how BCLK is affected and how to best optimize BCLK scaling
Quick Note for BCLK tuning
BCLK clocking is considerably reduced with this new CPU architecture and as such it is recommended to focus on Turbo Multiplier adjustments for overclocking. With that noted should you choose to make adjustments to the BCLK, ASUS has enabled extensive control to maximizing scaling.
Internal testing shows BCLK ranges from 102 to 109.1 with the largest level of scaling dependency placed on the quality of the CPU. CPU Frequency and speed is also directly tied to BCLK scaling. Internally we know that BCLK tuning largely depends on the CPU with approximately but we have noticed up to a 20% dependency on scaling potential based on the board design and PWM utilized.

At 4.9GHz, generally the maximum clock speed will not change with a different combination of multi and bclk in this particular example.
Example-
100x49 = 4.9GHz
103x48 = 4.9xxGHz
Generally the CPU will not do much more than what your maximum CPU multiplier range is in most cases. Keeping this in mind, we offer very fine adjustments down to 0.1x increments to allow for the maximum BCLK tuning.

Lastly when considering adjustments to the BLCK range, it is important to remember it will affect the memory divider/strap and DRAM frequency. Keeping this in mind you may want to adjust to a lower divider if your memory does not higher frequencies. This especially true when attempting to sustain 4 dimm and high memory density configurations with high BCLK and high Turbo Multiplier values.

Hope this helps. As always please enjoy the rest of your day.

 

 

 

Quote:
Originally Posted by Juan_Jose;4710467 
Additional Information for those that do not want to read through the guide.

Assuming you have a CPU that can execute and hold a 48 multi the screen behold will show you how to quickly enable a 4.8GHz OC. Warning: Spoiler! (Click to show)

1.110117160750.png
Select Ai Overclock Tuner,Select Manual
2.110117160757.png
Now see the expanded options for Turbo Ratio Control and Select By All Cores in OS.
3.110117160803.png
Now manually defined 48 value in each of the core values ( 1 , 2 ,3, 4 )
4.110117160817.png
Depending on what your retail CPU is capable of ( which Auto Tuning should provide you an idea of ) Enable this option! This option is specifically designed for D2/Retail Parts and allowing for higher multi overclocks especially when at or exceeding 48x. Additionally this option can be used should you not have it enabled and generally cannot boot with a higher multiplier. It is advised to try this option after you have tried all other standard options. This option is not for increasing stability of a OC that can already post and boot into an OS.
5.110117160844.pngSelect Loadline Calibration,Select Ultra High this value will provide overall the closest load level of voltage to the value defined in the bios or AiSuite II
6.110117160857.png
Enter a value of 350. This is best for sustaining stability at multis of 48x or above. This is key especially for running unrealistic loading testing such as prime or linx.
7.110117160900.png
Phase Control enabled Extreme this ensures the highest level of current and overall power delivery for the board under heavy loading.
8.110117160905.png
Ensures the VRM managment system is balancing for the most power possible ( current as opposed to temperature ) generally only for 48x multi overclocks or above.
9.110117160917.png
Select Manual Voltage - This will allow for a consistent voltage to fed to the CPU to ensure stability.Keep in mind that should you want the most efficient overclock you will want to use offset as this will allow the voltage to track the VRD of the CPU and have the voltage fall and rise depending on the loading state of the CPU.
10.110117160927.png
Enter a CPU V Core Voltage value of 1.415 or 1.425

 

 

 



 

Some interesting information from compudaze about Vcore meassuring when LLC at Ultra High


Quote:
Originally Posted by compudaze;13471239 
Just wanted to share some voltage info on my Asus P8P67 Pro. I set CPU voltage to 1.355V in BIOS and set LLC to Ultra High.

My voltages:
  • Idle CPU-Z: 1.344V, 1.352V, 1.360V
  • Idle DMM: 1.348V
  • Load CPU-Z: 1.336V, 1.344V, 1.352V
  • Load DMM: 1.33V
Quote:
Originally Posted by compudaze;13472015 
Back of board.

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How fast memory/timings do you need? - The Best Memory for Sandy Bridge

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Quote:
Originally Posted by turrican9;13499635 
Generally, people will say that higher mem frequency is better than lower speed and tighter timings.

I would think that combination would be pretty close to each other anyway. Probably not going to be able to feel a difference for general use.

Why not benchmark it?

Others have any feedback on this?

Here is a test comparing several combinations. Rather old but still...

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Keep in mind, the differences would be even smaller on higher resolutions, due to the GPU bottlenecking more and more.

 

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