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>>The Official ASUS P8P67/P8Z68 & P8Z68/GEN3 Series Owners Club>> - Page 814

post #8131 of 9343
Quote:
Originally Posted by owcraftsman View Post

Do either of you have the ability to ADJUST VCCSA in your bios?
I know I lost that ability when updating from the original bios release on z68 and moving from p67 to z68.
It's my understanding it has been removed from most bios (asus at least). 
In an effort to help you understand what's happening all I know for sure it what I have seen happen on my own systems. I know vccsa adjust dynamically.  For example at default setting/stock clocks either load or idle my vccsa voltage hovers around .0925 (the default). When I take the same system and set to run a 4.6 overclock it hovers at 1.111vccsa. I conclude it dynamically adjust. In an effort to understand why I had to tinker because there is no setting in my bios to effect a change of this parameter. After much consternation I know that adjusting the vccio has an effect on raising the SA voltage. Although electrically the vccio effects the i/o range of the CPU pins it does not effect memory pins which one would assume is the IMC. In there lies the source of confusion. Taken logically it would appear counter productive then to adjust the vccio to improve memory compatibility since it doesn't effect the memory pins however adjusting it directly effects the dynamics of the SA voltage which is in part the IMC which is why it's effective. I know it's complicated and I don't make it any easier by my inability to articulate it properly but do try to digest what I'm suggesting here. This explains why most feel the vccio is the IMC voltage when in actuality it is not. It also explains why adjusting vccsa, when available, has an adverse effect. It needs to be controlled by the Proc and hard setting it when it needs to be dynamic is overly complicated or impossible to nail down at best.

FYI: I use Adia64 (paid ver) to monitor vccsa and you can check for yourself the dynamic nature of the vccsa and the effects adjusting vccio has on it. I'm not trying to say vccio is the be all to end all in terms of fixing memory issues as it's not clear to me that other bios parameters don't have similar effects to the dynamic vccsa voltage not the least of which maybe PLL voltage adjustments and LLC settings all may play a role in someway. I'd have to do more testing to understand completely.  What I do know is I used stock clocks vs overclocked settings as evidence so the latter involved changing PLL and LLC but the vccio adjustment was only needed when running all four dimm slots populated at memory & cpu overclocked speeds. Otherwise the auto setting for vccio and vccsa is adequate for most cpu overclocks and 2x dimm slot overclocked memory.

In any case, as always, I hope this helps!

Quote:
Originally Posted by owcraftsman View Post


+1
  • VCCSA: Starting with the second-generation Core i processors (“Sandy Bridge”), the VTT voltage was renamed to VCCSA, and is called “system agent.” It feeds the integrated PCI Express controller, memory controller, and display engine (i.e., the “2D” part of the graphics engine).
  • VCCIO: Available starting with the second-generation Core i CPUs (“Sandy Bridge”), this voltage is used for feeding all input/output (I/O) pins of the CPU, except memory-related pins. On CPUs that have this voltage, it is also used to feed the thermal control bus (PECI, Platform Environmental Control Interface).

source

VccSA – This is the voltage with controls the “System Agent” (new “uncore”).  Since the L3 cache has been moved to the core, the only thing left on the System Agent that concerns us as overclockers is the integrated memory controller (IMC).  It’s already been discovered that the IMC on Sandy Bridge is quite robust, and usually won’t need any additional voltage for speeds up to DDR3-2000 and possibly even higher.  I found I needed about 1.15V for maximum potential when running very fast memory speeds.  This may also be important with very high density DIMMs or when fully populating the DIMM slots on your motherboard.  At this time, I would caution using any more than 1.2V on the VccSA.
VccIO – This is the voltage which controls the SA’s IO. Many users and manufacturers are taking issue with my claims of the SA voltage being most important for IMC overclocking. While I cannot explain my personal results, they definitely go against the majority. With that being said, the motherboard manufacturers and many uses will tell you to only adjust the VccIO, and leave the VccSA alone…I’m recommending you try both, and see which works better for your CPU. My testing was difinitively VccSA reliant. At this time, I would caution using any more than 1.2V on the VccIO.

source

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.



VCCSA/VCCIO - On previous platforms (P55/X58) we had the Uncore to describe any part of the CPU that wasn't the actual core, so this would be the memory controller, PCIe and so on, Sandy Bridge CPUs have a different architecture, and with that comes a whole new bucket load of acronyms, VCCSA is the voltage for the "System Agent", which in a nutshell, is the Sandy Bridge equivalent of Uncore. VCCIO is the I/O voltage for the memory controller. Adjusting the VCCSA and VCCIO voltages can help at higher clocks with higher memory speeds and tighter timings, more on this later.

source

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

souce


VCC/VCCIO/CPUIO
It's CPU Input/Output (IO voltage terminals. This voltage work just like QPI/VVT/IMC and the default voltage is

1.05v but it needs to keep within 1.10 - 1.20v when your overclock beyond 4GHz, increasing this voltage also help

to improve the stability when 4 memory DIMMs occupied and its max speed (2133MHz). This high voltage

doesn't seem to affect overclocking.

VCCSA

This is "System Agent" voltage inside the CPU. Since Sandy Bridge's IMC (Integarated Memrory Controller) and

PCI-E controller are very robust therefore you don't really need high voltage to run your DDR3 at highest speeds.

The default voltage is 0.95v and it is not important to have it above the default value. It's best to keep it at default.


source
ult value. It's best to keep i
VCCIO: more commonly known at QPI/VTT voltage, this is the VTT voltage. Formally known as Processor Power for I/O it is the voltage for the integrated memory controller as well as the PCI-E controller. While Intel’s Maximum is 1.05 +/- 3% = 1.08v, you can go higher, much higher. I would recommend staying below 1.2v for 24/7 use, but depending on the quality of the IMC on your chip, I have seen 2133 MHz done on as little at 1.1v. I used 1.12v for overclocking my Dominator 1600 MHz to 1866 MHz, and it did it without any problems. Do realize that this voltage contributes heat as well to the whole thermal package.

VCCSA: More commonly known as System Agent Voltage. Intel’s maximum System Agent Voltage (Vccsa) is 0.971v and minimum is 0.879v. Stock is 0.925v. System Agent Voltage should NOT be touched, it is supposed to be a fixed voltage, and it powers many things that the VCC does not power. One of the most important is the Power Control Unit (PCU) which controls internal power allocation of the processor. This voltage is to be generated by a separate VRM than used for SVID. So on the P67A-UD7 this voltage is generated by a two phase buck analogue PWM, with 4 phases, this voltage and the VTT (Vccio) come from the same VRM(not surprisingly voltage read points are right next to each other as well).

source

Lots of conflicting statements here bottom line over and over agin bumping vcccio memory controller or not fixes memory compatibilty issues either at high speed or 4x dimm slot population.

This is exactly the confusion I'm talking about.

I have the initial BIOS release on my board and I only have VCCIO as an option, nowhere can I find VCCSA. I read that updating the BIOS would show that VCCSA setting.

When looking for the highest overclock for the RAM, is it safe to just fix VCCIO to 1.2V, VDIMM to 1.7V, and VCORE to 1.4V (@45x CPU multi)?
Quote:
Originally Posted by error-id10t View Post

I've read these last few pages with interest to see if someone can find a solution.

Now, neither of my Z68-V Pro or Z77-V boards have had both of these options, only VCCSA. I keep VCCSA at auto (0.925v) for my 2133Mhz CAS9 RAM but it only populates 2 DIMMs - XMP1 makes it a 2134Mhz while XMP2 makes it a 2132Mhz and both profiles set the 'memory controller' to 1.05v automagically.

When I download AIDA extreme trial, it shows my RAM volts at 1.625v (it's set to 1.65v in BIOS by the XMP profile) and VCCIO at 1.05V which appears to match the 'memory controller' volts value - however, if I up the VCCSA manually in BIOS then VCCIO in AIDA has gone up too. But because I cannot find VCCSA value in AIDA (?) I can't tell if it's 1:1.

Neither of these volts change under Prime Blend load or under idling.

Not a lot of helpful information, just figured I'd post what I see.

Hmmm, interesting that you only have VCCSA as an option.
post #8132 of 9343
OK, I have a question on a Asus P8z68-V Pro/Gen3 , i7-2600K, and this ram:

http://www.newegg.com/Product/Product.aspx?Item=N82E16820231311

I'm using slots A2 and B2. I got the ram back from Gskill for a RMA today. When installing one stick, it auto overclocks the ram to 1666. When I installed the 2nd stick, it would not boot . I figured the bios was setting the speed to 1666 and the ram or mobo could not handle it with 2 sticks. The mem light was flashing. I did the hold mem button down to have the bios reset the parameters, figuring it would set the speed lower for 2 sticks. but no go. I had to uninstall 1 stick, clear cmos, and manually set the speed to 1333, then insert the 2nd stick. It's now running OK at 1333.

Is this normal? I don't really care about overclocking this rig, but is something fishy with the ram slots here?

forgot to mention that AI overclock tuner was set to auto, so it should load the optimal settings, which for 1 stick was 1666, but for 2 is 1333 and selecting the XMP option is not available with this ram and board, according to Gskill, this ram is : "XMP Ready for 3rd Generation Intel Core Processors and Z77 platform"..
Edited by Geezerman - 1/18/13 at 10:24pm
post #8133 of 9343
Quote:
Originally Posted by kevindd992002 View Post


This is exactly the confusion I'm talking about..
When there is a confusion, I would refer to official documentation where in this case is the Intel's datasheet.
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post #8134 of 9343
Quote:
Originally Posted by kizwan View Post

When there is a confusion, I would refer to official documentation where in this case is the Intel's datasheet.

Yeah but owcraftsman already explained it very well, didn't he?
post #8135 of 9343
Yes owcraftsman explained it very well. You probably missed my previous post here where I added another prove in a form of a screenshot of the Intel datasheet for 2nd generation Intel core processor. It should clear things up. Some guides based on (overclocker) experience & old information, that's where lies the confusion. What I'm trying to say is always go to the source to get correct information.
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post #8136 of 9343
Quote:
Originally Posted by kizwan View Post

Yes owcraftsman explained it very well. You probably missed my previous post here where I added another prove in a form of a screenshot of the Intel datasheet for 2nd generation Intel core processor. It should clear things up. Some guides based on (overclocker) experience & old information, that's where lies the confusion. What I'm trying to say is always go to the source to get correct information.

Oh ok. Got that, thanks for the tip mate thumb.gif
post #8137 of 9343
Quote:
Originally Posted by kevindd992002 View Post


This is exactly the confusion I'm talking about.

I have the initial BIOS release on my board and I only have VCCIO as an option, nowhere can I find VCCSA. I read that updating the BIOS would show that VCCSA setting.

When looking for the highest overclock for the RAM, is it safe to just fix VCCIO to 1.2V, VDIMM to 1.7V, and VCORE to 1.4V (@45x CPU multi)?
Hmmm, interesting that you only have VCCSA as an option.

BUMP!
post #8138 of 9343
Im having a issue with a system I just built.
here are the specs
Intel i7 3770
Asus P8Z68-V Pro/Gen3
Kingston KHZ16C10B1RK2/ 16X Blue 8Gx2 Red
CM 420w Silent pro M2

the issue is one that a few other people have where the system will
start up
Fans spin up (CPU and System fan)
red cpu LED goes on 1 sec then off
red mem LED goes on one sec then off
cpu LED on then whole system off
then loops again
Nothing at all on screen or no beeps during this whole process.

I havent done anything yet... i.e. reset BIOS or CMOS or update BIOS as i dont have the means at hand... i will probably need to take it back to supplier for that.

this cycle happens even if I unplug EVERYTHING except the ram. if i remove the ram the system stays on, but still no beep or anything showing on screen.
post #8139 of 9343
That sounds like a bad RAM stick, even though the system passed it. Try each stick 1 by 1, in the same slot every time, and if all 4 fail, also try them all in a different slot to see if that slot is dead.
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post #8140 of 9343
Quote:
Originally Posted by snake eyes View Post

Im having a issue with a system I just built.
here are the specs
Intel i7 3770
Asus P8Z68-V Pro/Gen3
Kingston KHZ16C10B1RK2/ 16X Blue 8Gx2 Red
CM 420w Silent pro M2

the issue is one that a few other people have where the system will
start up
Fans spin up (CPU and System fan)
red cpu LED goes on 1 sec then off
red mem LED goes on one sec then off
cpu LED on then whole system off
then loops again
Nothing at all on screen or no beeps during this whole process.

I havent done anything yet... i.e. reset BIOS or CMOS or update BIOS as i dont have the means at hand... i will probably need to take it back to supplier for that.

this cycle happens even if I unplug EVERYTHING except the ram. if i remove the ram the system stays on, but still no beep or anything showing on screen.
it's because you have an IB CPU on a Z68 board,
odds are you needed to update the mobo BIOS first (with a SB chip) then install the IB chip (3770).
for it to run properly.
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