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4.8GHZ OC stable on Prime95, Unstable for Folding. Help! - Page 2

post #11 of 25
Do yourself a favor and enable PLL overvoltage

Also, 1.41 is perfectly fine for 24/7. Heck I ran my 2500k upwards of 1.48 for close to 8 months with 0 issues.


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post #12 of 25
Internal PLL Overvoltage for only 4.8GHz which lasts 9 hours in Prime95's Blend test?

I don't know about that...

Actually, I think lowering the CPU PLL Voltage from 1.8V (Auto) down to about 1.70 to 1.71V could help. It has already helped many, and it has helped me.
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post #13 of 25
PLL overvoltage not needed, just increase the the vcore a notch and run the custom blend test with 90% of your available ram. As Twocables has said, reduce PLL voltage to 1.7 and work around in that region.
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post #14 of 25
Thread Starter 
Ok so after 53 mins, core number 6 failed in Prime. My temps were starting to get pretty high too. They maxed out at 75 degrees on core #3 which is always the hottest running core. So I changed the settings to everyone's recommendations. I also swapped out my (2) 120mm fans on top with some Silverstone 120mm fans. I originally intended on using these but since they require the use of their fan controller, I tried using the fans that came with the Rasa kit. Right now the max the temp has reached is 70 degrees on core #3. They are all staying right around 60-65. I upped my vcore to 1.45, changed the PLL voltage to 1.7 and also change the duty control to extreme and CPU capability to 110%. We will see how this runs now. If I have to use these loud ass Silverstone fans, then so be it. I'll just have to mod my case to hide the fan controllers under the top mesh panel. I'll probably also conjoin the fans to just 1 fan controller. And then I'll only use the fans at 100% when I leave work for the night so no one will be bothered by their noise.
    
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post #15 of 25
1.45V is a large amount of vCore for 4.8GHz, but you do have HT enabled so I can't complain much.
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post #16 of 25
Thread Starter 
I need HT for some of the programs I run. Plus it helps for folding. If my temps stay around this level with my silverstone fans on full blast while folding, then I think I am going to A. replace the 200mm stock fan on the front of the case that is cooling my 200mm radiator(maybe even do a push, pull setup), B. build air boxes for the 120mm fans and the 200mm so there isn't a dead spot, C. Redo the TIM on the CPU, and if all else fails, I am going to look at getting a different pump/res setup, like a MCP655 with a speed controller. Something that is going to pump the water faster.

My goal is to keep my system quiet. I work in a small office and right now with the fans going full blast I can hear my system all the way across the office. I may just have to face the facts that I can't acheive the level of silence I want with this fan combo/power level. Maybe I'll look into some gentle typhoons to replace the silverstone's.
    
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post #17 of 25
If your having overheating issues and you have switched thermal paste I would say next thing is to replace your coolant or add a bigger radiator with more fans. If it still doesn't cause issues than it can be that your chip cannot handle 4.8Ghz and maybe you should dial back to 4.7Ghz or even 4.5Ghz.. You won't see much difference with folding at 4.5Ghz vs. 4.8Ghz maybe like 30secs less on work units but I even doubt that. You need to find the most stable setup with a nice overclock. Especially if you are at such a high temp under water cooling. I never like getting above 40C under full load with water cooling. Also having HT enabled can most likely cause some issues. I wouldn't then run such a high overclock with HT enabled.

Pumping water faster might help, but I doubt it. It has to do with how cold the water stays. Meaning how efficient the radiator is. If you might want to go to TEC cooling because you might have hit the threshold of effective overclock with that cpu and just insulate the motherboard.
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post #18 of 25
Dis might seem obvious, but make sure you enable "round off checking". If you have alraedy done so, great
post #19 of 25
Quote:
Originally Posted by hollowtek View Post
Dis might seem obvious, but make sure you enable "round off checking". If you have alraedy done so, great
What is "Round Off Checking"?
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i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
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post #20 of 25
Quote:
Originally Posted by Awkwardly Awesome View Post
I need HT for some of the programs I run. Plus it helps for folding. If my temps stay around this level with my silverstone fans on full blast while folding, then I think I am going to A. replace the 200mm stock fan on the front of the case that is cooling my 200mm radiator(maybe even do a push, pull setup), B. build air boxes for the 120mm fans and the 200mm so there isn't a dead spot, C. Redo the TIM on the CPU, and if all else fails, I am going to look at getting a different pump/res setup, like a MCP655 with a speed controller. Something that is going to pump the water faster.

My goal is to keep my system quiet. I work in a small office and right now with the fans going full blast I can hear my system all the way across the office. I may just have to face the facts that I can't acheive the level of silence I want with this fan combo/power level. Maybe I'll look into some gentle typhoons to replace the silverstone's.

I'd recommend the push/pull setup on your rad. I found it lowered my temp nearly 5C using the stock XSPC fans, and some cheapy CM R4's, as opposed to the stock fans alone. If you have better fans I'm sure you could expect a little more.

I just finished 12 hours p95 blend @ 4.7ghz, now I'm testing 4.8ghz same voltage settings. So far it's up to 67C on hottest core. It's averaging around 54-60C most of the time.

edit - no threadjacking intended, I just wanted to let you knwo what I was experiencing
Edited by anubis1127 - 8/15/11 at 10:28am
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