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1100T @ 4.0ghz......24/7 safe voltage?

post #1 of 14
Thread Starter 
So last night I decided to increase my OC from 3.7 to 4.0ghz. I've been running @ 3.7ghz 1.400vcore since I built my rig back in August.

My question is this.....is 1.450vcore to 1.500vcore safe for 24/7 use on these CPUs? It runs normally at 1.560v, but under heavy prime95 or IBT load it increases to 1.490v, and sometimes even 1.501v.

As far as gaming or other real-world scenarios, it rarely if ever goes above 1.475v

My core temps maxed @ 66c after 40 passes of IBT on maximum settings (was using 3500mb RAM.) Again, during real-world use it never exceeds 55c.

Also on another note .... I'm starting not to doubt the "Phenom II performance decrease above 62c" thing. If this were true, should'nt linpack be showing lower Gflops the higher my temps go? Instead my Glops were consistent across the board -- the same results at 66c after an hour that I was getting at 23c when the test first started.
    
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post #2 of 14
Quote:
Originally Posted by LesPaulLover View Post

I'm starting not to doubt the "Phenom II performance decrease above 62c" thing.

Thuban improves it, a lot:thumb:
Don't pass 1.55v and you're fine.
post #3 of 14
More than 1.475v would be overvoltage for 4.0Ghz . I mean whatever you set in BIOS do not let it go over 1.475v during full load within Stability Test. Mine is perfect stable at 1.456v (drops from 1.525v in BIOS ). You may also try lower settings.

66c is very high, you must keep it under 60c. GFLOPS doesn't matter, it won't go lower at high temp but the Entire Chip will be starting to degrade at such high temp. You must remember that according to AMD Power and Thermal Datasheet, the limit is 62c for 125watt TDP CPUs.
648
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post #4 of 14
Thread Starter 
Quote:
Originally Posted by sumitlian View Post

More than 1.475v would be overvoltage for 4.0Ghz . I mean whatever you set in BIOS do not let it go over 1.475v during full load within Stability Test. Mine is perfect stable at 1.456v (drops from 1.525v in BIOS ). You may also try lower settings.
66c is very high, you must keep it under 60c. GFLOPS doesn't matter, it won't go lower at high temp but the Entire Chip will be starting to degrade at such high temp. You must remember that according to AMD Power and Thermal Datasheet, the limit is 62c for 125watt TDP CPUs.
648

Unfortunately for me....no.

I requite 1.425v for 3.8ghz, 1.450v for 3.9ghz, and 1.475v (MINIMUM) to hit 4.0ghz.

I've decided to disable one core, which allows me to run 4.0ghz stable @ 1.450v. Disabling one core also brings my temps down literally 10-15c under full load. This way I figure I still have a quad core for gaming (I manually set processor affinity) and then I have a 5th core free to handle and background tasks, check gamefaqs while I'm playing, chatting...etc.

These are the absolute minimums. I've done extensive stress testing. I can go prime stable for 14 hours running 3.9ghz @ 1.450v. I cannot pass 15 minutes of prime running 3.9 @ 1.425v. Same for all the other clockspeeds and their respective voltages.
    
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post #5 of 14
It seems your cpu really needs high voltage. Actually you can set to 1.50v to 1.55v, main problem is the temp, because if you are able to make its temp within 60c, then higher voltage isn't a problem. It is strange 1100T require such high voltage for only 700mhz overclock as the default frequency is 3.3ghz at 1.296v......well what CPU cooler are you using ? What is ambient temp ? If you are overclocking through unlocked multiplier, why don't you try ocing using higher base clock with lower cpu multiplier ? Also, are you sure your memory is perfect stable ? Tell us whole settings you've set in bios.
Edited by sumitlian - 4/12/12 at 8:54pm
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post #6 of 14
Thread Starter 
I've spent months this thing I've tried everything.

My RAM is stable at both 1333mhz and 1600mhz at all those settings I listed.

Heat is the problem I think -- disabling 1 core is fine with me. I can run with 5 cores 4.0ghz, leaving me a solid 4 for gaming and free core for additional tasks. Why final stress test is always running Prime95 blend AND Unigine at the same time for at least an hour looped.
    
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post #7 of 14
1.5v is generally the max safe for 24/7 constant voltage assuming you can keep temps in check. 1.55v would be the absolute max you'd ever want to do, but again temps will be hard to control on air cooling at that voltage.

I remember when I had my Hyper 212+ and my 1090T. Temps would go rocketing through the 60's and even touching 70s at 1.55v under IBT.
Edited by iinversion - 4/13/12 at 2:12am
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post #8 of 14
Seriously don't listen to all these people above spouting crap, 1.55v is fine and so are the temps.

There's a thread on here explaining that although 65c is max AMD allowed some head room, my Phenom 2 x6 hit 70c @ 4.1Ghz with 1.51v under Intel Burn Test.

Your chip won't die and won't degrade any quicker then it normally would.
post #9 of 14
I ran my PII x4 965 @ 1.55 @ 4.0 with no issues.
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post #10 of 14
Any update?
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