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Phenom 955 BE OC questions

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May 27, 2011 2:05:12 AM

I just got my CoolerMaster Hyper 212+ in the mail today and was super excited to try to OC my 955. It hit 3.6ghz with no problem at all by just increasing the multiplier. I tried for 3.8 and it wouldn't boot, so I lowered to 3.7 and it boots just fine. However, when i try to put any kind of load on it (3d animation especially) it immediately blue screens. I read on here that I should raise my CPU voltage in small increments. I went from 1.4v to 1.425v and I'm still getting blue screens (though they do take a little longer). What is a good voltage setting for me to use? I'd like to get my CPU to 3.8-4.0 range, but i'm new to OC'ing and afraid i'm going to fry my system if I use the wrong voltage. Any help would be greatly appreciated! Thanks!

My setup is:
AMD Phenom II x4 955 BE
MSI 870A-G54 MOBO
CM Hyper 212+ Heatsink and Fan
8gb Gskill Ripjaw Ram 1333mhz
ATI Radeon HD4670 GPU
OCZ 750W PS
1.5TB WD Caviar Green HDD

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a c 138 à CPUs
a c 241 K Overclocking
May 27, 2011 7:54:25 AM

what is massage blue screens ...?
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a c 133 à CPUs
a b K Overclocking
May 27, 2011 3:10:36 PM

Monitor your temps while running something like Prime95 to test for stability. A lot of people use CoreTemp. As long as they don't get too high, you can increase the voltage a little more.
...but ask yourself, how much performance improvement are you seeing? Quite frankly, if you're at 3.6 stable (which you have yet to confirm by stability testing), that's pretty decent. You may yet need that small increase to 1.425 to make 3.6 truly stable under load, and the more voltage you add, the greater the chance you will shorten the life of your CPU.
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May 27, 2011 8:14:03 PM

Onus said:
Monitor your temps while running something like Prime95 to test for stability. A lot of people use CoreTemp. As long as they don't get too high, you can increase the voltage a little more.
...but ask yourself, how much performance improvement are you seeing? Quite frankly, if you're at 3.6 stable (which you have yet to confirm by stability testing), that's pretty decent. You may yet need that small increase to 1.425 to make 3.6 truly stable under load, and the more voltage you add, the greater the chance you will shorten the life of your CPU.

At 3.6 I ran an extremely hard render in Cinema 4D (which took about 30 minutes) and temps never got above 45C. and then i ran the stability test in AMD overdrive for 30 minutes with temps never reaching 45C again. should I still run Prime95? and for how long? Thanks for the help!
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May 27, 2011 8:25:24 PM

1.45v or 1.5 for those speeds tha you want to achieve.
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a c 103 à CPUs
a b K Overclocking
May 27, 2011 8:35:53 PM

Yes run prime 95 it stresses it alot more than the AMD overdrive.
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May 27, 2011 9:21:08 PM

Ok I'm running prime now. I also went back and disabled coolnquiet and the spread spectrum features because I hadn't done that yet. I'll post back after prime has run for a little while.
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May 27, 2011 10:25:14 PM

I ran Prime95 for an hour with absolutely no errors running at 3.6ghz and at stock 1.4 Core voltage. my temps never broke 45C either. should I increase voltage to 1.45 and try at 3.8?
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May 27, 2011 11:36:57 PM

i tried upping the voltage to 1.45 @ 3.7ghz and still getting BSOD after 5 minutes in prime 95. what could be the problem?
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a c 138 à CPUs
a c 241 K Overclocking
May 28, 2011 2:05:30 AM

what is massage blue screens ...?
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May 28, 2011 2:30:33 AM

henydiah said:
what is massage blue screens ...?

'im honestly not sure. when the screen cuts out before the blue screen pops up, my screen resolution/source box from my monitor pops up so i cant see the entire message. I would do it again, but i'm afraid of screwing it up lol wouldn't constantly blue screening mess up the system?
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May 28, 2011 5:06:10 AM

well i went back and increased my voltage until i could get an hour and a half in prime95. in cpu-z my voltage is 1.456V and i'm running at 3.7GHZ and my temps maxed out at 51C. is there a reason why CPU-Z is reading my voltage as 1.456 when i have it set to 1.47 in my BiOS?
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a b à CPUs
a b K Overclocking
May 28, 2011 5:16:03 AM

Maybe the bios just isn't that precise, so it gets nearby.
Incidentally, my 965 is at 3.9 and 1.425 V.
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a c 138 à CPUs
a c 241 K Overclocking
May 28, 2011 5:43:08 AM

CPU-Z is reading my voltage as 1.456 when i have it set to 1.47 in my BiOS , this called Vdrop , and vdrop depend on motherboard. generally 1.425 - 1.45 get 4ghz for 965 BE .
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a c 86 à CPUs
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May 28, 2011 10:18:12 AM

henydiah said:
CPU-Z is reading my voltage as 1.456 when i have it set to 1.47 in my BiOS , this called Vdrop , and vdrop depend on motherboard. generally 1.425 - 1.45 get 4ghz for 965 BE .

It COULD be vdroop, but it could also be an incorrect reading. you will also notive the voltage will go up and down a bit depending on load and temperature. Dont worry about it. Just dont go crazy on the voltage or you will kill your chip eventually. If you can get it to 3.80-3.9 ghz with 1.5v then your pretty safe, from what ive heard, but every chip is different.
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May 28, 2011 12:39:47 PM

yeah i'm gonna try for 3.8 later today, possibly 3.9 if the temps are ok. Thanks for all the help!
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May 28, 2011 12:40:02 PM

Best answer selected by ChaosV2.
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May 29, 2011 8:17:43 AM

This topic has been closed by Mrface
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