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3770k 4.5Ghz unstable in prime95

post #1 of 10
Thread Starter 
I've just stressing the cpu using blend option in prime95, and after 2 hours the screen freezed, and the test stopped.


The vcore was 1.22V, should i increase the voltage, or what i should make to be stable ?
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post #2 of 10
Did the test stop, or did you BSOD? If you BSOD you need to pay attention to the codes and compare it to the BSOD code list here:

0x101 = increase vcore
0x124 = increase/decrease vcore
0x0A = unstable RAM/IMC
0x1E = increase vcore
0x3B = increase vcore
0x3D = increase vcore
0x50 = RAM timings/Frequency unstable
0x109 = Not enough or too Much memory voltage
0x116 = Low IOH (NB) voltage, GPU issue
0x7E = Corrupted OS file

If workers are failing or the application is crashing, try to up the vcore as well.
post #3 of 10
Thread Starter 
I was out from my town for 12 hours, and i've let it in prime95 to test it.

And when i've got home the screen was in freeze mode, i could move the mouse for couple of seconds. And on the screen i've saw on what hour i've started the test 10:30 PM(morning), and on 12:00 PM the screen freezed (after aprox. 2 hours), the temp in core temp was 77-78 degrees.

Was not a BSOD, only a freeze, and in games (i've played many hours battlefield 3) the cpu was stable, no crashes, bsod.

So what should i do, to make it stable ? Right now i've increased the voltage from 1.22V to 1.26V, and i will test it tomorrow in prime95.

No .dmp file in the OS, so it didn't bsod.
Edited by CalinTM - 9/8/12 at 12:27pm
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post #4 of 10
if you can play many hours on BF3 ...i consider that stable and wouldnt worry about it. i actually used that as my tester before i uninstalled the game.

1.22v is low for a chip, and that is good.

don't stress out too much on prime95, you will never get up to 100% cpu load. BF3/Crysis 2 are actually better 'real time' test IMO. You are going be using this computer to game not to blend prime95 24/7 with no achievement or anything in return.

on the other hand if you do fold, then yes figure out why its freezing up, probably needs more vcore.

if its mainly for gaming, i wouldn't worry about it at all. 2 hours is actually a good time. i just do 10 test of intel burn test and if it passes I call it a day and don't worry about it ever again. been running 4.5ghz no problem with whatever the heck i do with my computer. i bet u it will freeze up in prime95...but do i care? not really as my computer is used with gaming and i game for hours and hours...and no issues so i m happy with my OC.

remember OC for gaming is to push your gpus to prevent bottlenecking, if you are stable with BF3... then you have achieved your purpose.
Edited by mcc21 - 9/8/12 at 1:31pm
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post #5 of 10
Thread Starter 
Yes but freezing in prime95, could be the cause from some very rare freezes in games, or close application in games.

I will run then right now 10 loops of very high stress level in intel burn test. I hope it will pass, then i will post the results here.

PS: I've tested the CPU on auto voltage and stock block (with turbo at 3.9Ghz) For 8 hours and no problems at all.
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post #6 of 10
Try lowering your PLL voltage down some and use the offset mode on your vcore and set it to +.06 or however much would get it up to 1.25v and you should be good.
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post #7 of 10
Thread Starter 
In intel burn test is stable.

How much i should lower the PLL ?
sy2xib.jpg

http://i50.tinypic.com/sy2xib.jpg

How the offset voltage works ? With that i am able to set a lower voltage for idle, and on full load the overclocked voltage ?
Edited by CalinTM - 9/8/12 at 2:09pm
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post #8 of 10
Bump v core to 1.25

I think for your chip 1.22 may not be cutting it. BF3 can no way determine whether a CPU is stable or not.
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post #9 of 10
i think you should try with manual voltage

here is mine currently still running prime



iv set my cores x46 x45 x44 x43 for each one
and voltage manual at 1.2

when I use prime that uses all 4 cores it goes on 4.3Ghz and uses 1.17-1.18 V and temperatures under 60C with my h100 that im not sure even if the stock fans are at full speed

yes the screenshot was taken when i had my room temperature higher
now its like 25C and all my cores stay under 60C


my ram is clocked a lot and with way better timing then stock
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post #10 of 10
Thread Starter 
I needed to put the voltage in bios to 1.27, and in the OS displays, 1.256V in idle, and in prime95 1.248V

I will test it today in prime95 to see if it's stable.

Strange thing is, that in intel burn test 10 loops of very high is stable at 1.2V, and in all games stable as well.
Edited by CalinTM - 9/9/12 at 3:52am
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