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post #2231 of 5036
Update: Been stress tesing it with Prime95. Load Temperatures are up to 64c (constant) even with the Stock HSF whirring to an insanely noisy 6535rpm (didn't know the bugger could go so fast O.o) ....

Should I come down to 3Ghz ?
Edited by RDx - 8/27/10 at 2:55am
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post #2232 of 5036
Quote:
Originally Posted by RDx View Post
Update: Been stress tesing it with Prime95. Load Temperatures are up to 64c (constant) even with the Stock HSF whirring to an insanely noisy 6535rpm (didn't know the bugger could go so fast O.o) ....

Should I come down to 3Ghz ?
You're way too hot on that. You need to be under 62c!
    
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post #2233 of 5036
Its down to 3.0Ghz. Won't try more till I get a cabinet and HSF .....
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post #2234 of 5036
Quote:
Originally Posted by RDx View Post
Update: Been stress tesing it with Prime95. Load Temperatures are up to 64c (constant) even with the Stock HSF whirring to an insanely noisy 6535rpm (didn't know the bugger could go so fast O.o) ....

Should I come down to 3Ghz ?
Here are the settings that work for me using the F7 BIOS available for your motherboard. Please turn the Core Performance Boost off. When three cores are operating, your threaded CPU benches, such as CPU Queen, will be halved. Using my settings with disabled onboard GPU, your CPU Queen score will be 38000. I might add that I am a bit disturbed by your CPUVID. Is this the result of Turbo Core? With Turbo Core off, it should report 1.29 or 1.30 V:

MB Intelligent Tweaker: (Default except)
IGX Configuration -> VGA Core Clock Control may be set as high as 800 MHz, but heats up North Bridge
CPU Performance Boost -> Disable
CPU Clock Ratio -> 14X
CPU Northbridge Frequency -> 9X (10X w/ IGP OC)
CPU Host Clock Control -> Manual
CPU Frequency -> 280 (275 w/ IGP OC)
HT Link Ratio -> 8X
Set Memory Clock -> Manual
Memory Clock -> X5.33
System Voltage Control -> Manual
DDR3 Voltage Control -> +0.05
NorthBridge Volt Control -> +0.1
SouthBridge Volt Control -> +0.1 or Normal
CPU NB VID Control -> +0.15 (0.175 w/ IGP OC)
CPU Voltage Control -> +0.125

Advanced BIOS Features: (Default except)
AMD K8 Cool&Quiet Control -> Disabled
Init Display First -> OnChipVGA

PC Health Status: (Default except)
CPU Warning Temperature -> 60 C
CPU FAN Fail Warning -> Enabled
SYSTEM FAN Fail Warning -> Enabled
System Smart FAN Control -> Disabled
Edited by Headless Fansprings - 8/27/10 at 5:23am
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post #2235 of 5036
There seem to be four schools of thought on oc'ing the CPUNB. One is don't bother, you're not going to notice any real-world difference. Another is the opposite - push it as far as you can. Another relies on math to work out the optiumum setting - (RAM speed / 2) x 3. Yet another also requires some maths to work out - (CPU Speed x 2) / 3.15. Both math methods seem to state that going beyond your optimal setting will decrease performance.

Currently I've gone back to oc'ing the CPU to 3.5ghz (14 x 250) with my RAM running at 1666mhz. Using the RAM math method (in my case 833mhz x 3 = 2499) setting the CPUNB to 2500 is optimal. However using the CPU speed math method (in my case 7000mhz / 3.15 = 2222mhz) setting the CPUNB to 2250 is optimal.

I'm just looking for some guidance from the experienced oc'ers round here - what should I set the CPUNB to? Stock 2000mhz? 2250mhz? 2500mhz? Or crank it up to 11?

Also, completely unrelated - is 4 hours of Prime95 enough to determine stability?
Edited by iSeries - 8/27/10 at 5:48am
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post #2236 of 5036
Quote:
Originally Posted by iSeries View Post
There seem to be four schools of thought on oc'ing the CPUNB. One is don't bother, you're not going to notice any real-world difference. Another is the opposite - push it as far as you can. Another relies on math to work out the optiumum setting - (RAM speed / 2) x 3. Yet another also requires some maths to work out - (CPU Speed x 2) / 3.15. Both math methods seem to state that going beyond your optimal setting will decrease performance.

Currently I've gone back to oc'ing the CPU to 3.5ghz (14 x 250) with my RAM running at 1666mhz. Using the RAM math method (in my case 833mhz x 3 = 2499) setting the CPUNB to 2500 is optimal. However using the CPU speed math method (in my case 7000mhz / 3.15 = 2222mhz) setting the CPUNB to 2250 is optimal.

I'm just looking for some guidance from the experienced oc'ers round here - what should I set the CPUNB to? Stock 2000mhz? 2250mhz? 2500mhz? Or crank it up to 11?

Also, completely unrelated - is 4 hours of Prime95 enough to determine stability?
For stability, its usually recommended that 24 hours of prime is good, others think several hours of prime with Linx is best. Its really up to you, and what you have planned for your system. I use just a couple hours of prime, seeing as I game, my cpu wont be getting hit that hard. I fold as well which is why I tend to use prime with linx to make sure my oc can handle folding.

As for your CPUNB, I would suggest that you try both, run some tests, and see what the results are. I do know that as you OC your cpu, it needs to communicate information faster, thus upping the CPUNB. I believe my CPUNB is at 2400 at a modist 3.4Ghz. I will push it to 2500 when I get my new cooler, with a 3.5Ghz OC.
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post #2237 of 5036
I have heard also that 3x RAM speed for NB is the rule of thumb. I've also heard that there is no need to exceed 3GHz NB with less than 2000MHz memory, which follows the rule.

The NB gets stressed ~3 hours into prime blend with the 512 something or other test, so 4 hours is pretty stable....unless you fold, then maybe not.

Hope that helps.
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post #2238 of 5036
Quote:
Originally Posted by iSeries View Post
There seem to be four schools of thought on oc'ing the CPUNB. One is don't bother, you're not going to notice any real-world difference. Another is the opposite - push it as far as you can. Another relies on math to work out the optiumum setting - (RAM speed / 2) x 3. Yet another also requires some maths to work out - (CPU Speed x 2) / 3.15. Both math methods seem to state that going beyond your optimal setting will decrease performance.

Currently I've gone back to oc'ing the CPU to 3.5ghz (14 x 250) with my RAM running at 1666mhz. Using the RAM math method (in my case 833mhz x 3 = 2499) setting the CPUNB to 2500 is optimal. However using the CPU speed math method (in my case 7000mhz / 3.15 = 2222mhz) setting the CPUNB to 2250 is optimal.

I'm just looking for some guidance from the experienced oc'ers round here - what should I set the CPUNB to? Stock 2000mhz? 2250mhz? 2500mhz? Or crank it up to 11?

Also, completely unrelated - is 4 hours of Prime95 enough to determine stability?

Dude get that sucker up to 3Ghz. All that real world no difference is BS. First, try some synthetic benches like sandra... scores are crazy high with 3ghz NB, especially memory bandwidth. As far as real world goes, in gaming you probably wont notice the extra couple frames, but in folding or crunching BONIC work units when my NB is @ 3Ghz it is MUUUUUCH faster

Just make sure when you go that high that you drop the HT down and keep it around ~2000-2200
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post #2239 of 5036
Quote:
Originally Posted by iSeries View Post
There seem to be four schools of thought on oc'ing the CPUNB. One is don't bother, you're not going to notice any real-world difference. Another is the opposite - push it as far as you can. Another relies on math to work out the optiumum setting - (RAM speed / 2) x 3. Yet another also requires some maths to work out - (CPU Speed x 2) / 3.15. Both math methods seem to state that going beyond your optimal setting will decrease performance.

Currently I've gone back to oc'ing the CPU to 3.5ghz (14 x 250) with my RAM running at 1666mhz. Using the RAM math method (in my case 833mhz x 3 = 2499) setting the CPUNB to 2500 is optimal. However using the CPU speed math method (in my case 7000mhz / 3.15 = 2222mhz) setting the CPUNB to 2250 is optimal.

I'm just looking for some guidance from the experienced oc'ers round here - what should I set the CPUNB to? Stock 2000mhz? 2250mhz? 2500mhz? Or crank it up to 11?

Also, completely unrelated - is 4 hours of Prime95 enough to determine stability?
The brief answer is that overclocking your Northbridge link up to about 3000 MHz should not hurt your memory and cache performance, which can easily be benchmarked using Everest. The longer answer is that the optimal performance occurs at some value that is dependent on architecture. There was an excellent article on this matter, which I cannot locate at the moment. However, I can offer these as a partial substitute:

HERE IT IS:
******http://www.ocztechnologyforum.com/fo...-clock-is-best

** http://www.overclockers.com/forums/s...d.php?t=596023
http://www.overclockers.com/the-impo...the-phenom-ii/

http://www.anandtech.com/show/2792/6
http://www.tomshardware.com/reviews/...g-i7,2325.html
http://www.thetechrepository.com/showthread.php?t=160
http://www.overclock.net/amd-memory/...-vs-speed.html
http://www.madshrimps.be/?action=get...e&articID=1057

One further consideration is your memory latency. I managed 1666 Mhz with 9-9-9-30 timings. For most purposes, you are better off with a slightly lower memory frequency and tigther timings. I like 1492 MHz with 7-7-7-16 timings. As you continue to raise your HT clock, you will probably find that it is beneficial to drop your DDR3 multiplier to 5.33x.

Quote:
Originally Posted by groodal
Wow, didn't expect this cind of help, Thanks
i'm currently running memory @ 1562 mhz c8-8-8-24
so raising the NB to 3g will set the RAM freq to its position, then thats what i'll do.
My NB is @~2650mhz and i think it made some difference from 2k.
DDR3 multi i havent seen yet, but i'll find it
thanks for your help, i o u one x)
Quote:
Originally Posted by christoph
Quote:
Originally Posted by Headless Fansprings
You are best off running your RAM at stock voltages with mild overclocking. The OCZ PC10666 Platinum series run very well at 1466 and 1492 MHz at stock voltage and 7-7-7-16-1T timings. At 1600 MHz and 9-9-9-30-2T timings, they not only suffer in terms of performance and bandwidth, but also yield memory test errors. You can run your memory above stock frequencies, but you will benefit more from tighter timings like CL6 and CL7. See the article below:


ok???
http://www.ocztechnologyforum.com/fo...-clock-is-best


Re: Frequency vs. Timings

You will likely find a performance gain equivalent of about 150 MHz for every reduction in the leading increments of latency. Therefore, in order to match the memory performance of your 1800 MHz CL 9 RAM, you will be required to raise your DDR3 frequency to 1500 MHz with 7-7-7-16-1T timings. I believe that you should be able to achieve this with less volatge than in the former scenario. Moreover, the higher frequencies are liable to destabilize the IMC.

Look at this reference:

http://benchmarkreviews.com/index.ph...1&limitstart=3

I have posted others that account for the third variable, NB link frequency.

Please report back to me regarding your results.

Quote:
Originally Posted by lightsout
If you look aty my post, those were the timings and speed I had, actually I think it was 6-7-7-18-11-1t @ 1451 mhz.

Memtest gave better results at 1800mhz. It shows all that in the screen shots.

http://www.overclock.net/10902041-post3066.html
Indeed, they are! Are you asking me how to raise your DDR3 frequency by 3.5% in order to eliminate the performance disparity? The best way that I can think of is to raise your HT reference clock by 10 MHz. This should be a trivial feat using your configuration. If you cringe at the slightly higher Vcore, then I suggest you drop your CPU multiplier to 13.5X. This will also raise your NB link frequency and your memory benchmarks will outperform the 1800 MHz settings. Good luck!

Quote:
Originally Posted by lightsout
Actually I'm not asking you anything. Just showing you my findings, you pm'd me remember.
So it seems! Therefore, I leave the decision as to whether to implement my recommendations and report any results or conclusions entirely to your discretion. Good luck!

Quote:
Originally Posted by lightsout
I've messed around a little with my oc but it seems that other configs all take more vcore. And that I'm doing it just to do it as I dont really need 3.8ghz as it is.

So I always go back to this config. I may take you up and see if dropping to 13.5 multi will beat out the 1800mhz.
You may actually find that lower multipliers allow you to lower your Vcore slightly. I was able to raise my CPU frequency by 50 MHz with the 13X multiplier without increasing my Vcore. However, the higher RAM frequency did not justify the looser timings and, in addition, reported memory errors. If your RAM can tolerate the higher frequencies without compromising latency, lowering the CPU multiplier is definitely a benefit.

Quote:
Originally Posted by lightsout
I think it required some more volts on my cpu/nb. I'll play with it some more when I get a chance.
Absolutely correct! You may use my approximate formula:

CPU NB voltage = 1.15 + 0.00076*(NB freq - 2520) V

If you set the HT ref clock to 282 MHz and the NB multiplier to 10X, your CPU NB will need about 1.38 V.

Quote:
Originally Posted by lightsout
1.38 huh that sounds pretty high. I think right now I have it set at 1.22.
So what so you figure one would need for a 300 ref clock. I've seen posts saying not to go over 1.35 on the CPU/NB

Sent from my ERIS using Tapatalk
Your CPU NB voltage is unusually low for the Crosshair IV, but not unprecedented. Have you modified the other two NB voltages? In any event, the formula suggests that you will need to increase your CPU NB voltage by 0.076 V to about 1.3 V. Very safe, indeed! Please report to me when you have finished testing. Thank you.

Quote:
Originally Posted by lightsout
I played around for a minute last night but I could hardly get it to boot. I think I needed to loosen up the timings some. This weekend I should have some more time to play.

Edited by Headless Fansprings - 10/7/10 at 7:19am
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post #2240 of 5036
Quote:
Originally Posted by RDx View Post
Update: Been stress tesing it with Prime95. Load Temperatures are up to 64c (constant) even with the Stock HSF whirring to an insanely noisy 6535rpm (didn't know the bugger could go so fast O.o) ....

Should I come down to 3Ghz ?
Thats actually pretty good for the stock cooler.... Liek the others said though way to hot. Although nothing will get your CPU as hot a s prime will, so you are ok for normal useage, and even gaming. I ran mine for a bit with the stock HSF before I got my water loop up. @ 4Ghz it would hit almost 70C full load in prime, but playing crysis would only get up to like 45-50.

You will be good to go once you get a decent cooler
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CPUMotherboardGraphicsRAM
i7 5960X ASUS Rampage V Extreme 2x Nvidia 1080ti SLI 32GB Corsair Dominator DDR4 3400Mhz 
Hard DriveCoolingOSMonitor
Samsung 850 pro NVMe M.2 Custom EK watercooled loop Windows 10 Pro Triple LG 4K 27" 
PowerCase
Cosair 1500Ti CaseLabs M10 
CPUMotherboardGraphicsRAM
Delidded i7 3770K @ 5Ghz ASUS Maximus V Gene EVGA GTX 670 SLI - Heatkiller Blocks 16GB Corsair Vengeance DDR3 @ 2400Mhz 
Hard DriveCoolingOSMonitor
Samsung 840 EVO Custom Loop - EK Supreme HF Windows 7 Pro 64-bit Dell 30" + 2 x Dell 24" 
PowerCase
Sparkle Gold 1200W CM Stacker T01 
CPUMotherboardGraphicsRAM
Phenom II X6 1055T @4.0GHz (308x13) / 3.08GHz NB ASUS Crosshair IV Formula w/EK full coverage block ATI 5870x2 Crossfired @ 950/1250 8GB Corsair Vengeance DDR3 1600 
Hard DriveCoolingOSMonitor
OCZ Vertex 3 SSD Swifttech Apogee Drive Block/Pump Windows 7 64bit Pro ASUS 27" LCD 
PowerCase
Corsair Professional Series Gold 650W  Lian-Li PC-650A 
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