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Prime95 Shuts Down (Phenom II 965 OC)

Last response: in Overclocking
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November 8, 2012 2:15:02 AM

Hey Everyone,

I just built my system yesterday and I'm trying to OC my Phenom II 965. It's currently at 4.1mhz (from 3.4) and Prime95 will run for a couple of hours and then the program will shut down. I don't get any windows message saying that an unexpected shut down occurred or anything. However, when I try and go on Firefox afterwards it's all glitchy and the firefox screen is black, or shows a bunch of colorful pixels. Either that, or it simply won't open at all and it says that Firefox crashed.

I can restart the computer and everything works fine again. I should mention that while doing the prime95 test my cpu temperature hasn't exceed 58c in temperature.

I've only Overclocked by increasing the multiplier and I have the voltage at 1.44. Everything else I haven't touched in the bios. I'm using an MSI board with the click bios.

My specs are as follows:

Rosewill Blackhawk Mid Tower Gaming Case
MSI 990FXA-GD80V2 AM3+ Motherboard
Rosewill Xtreme Series RX850-S-B 850W
AMD Phenom II X4 695 w/ Coolermaster Hyper 212+
XFX Radeon HD 7870 Double D
Patriot Viper 3 8GB (2 x 4GB) DDR3 SDRAM
Seagate Barracuda ST1000DM003 1TB 7200 RPM 64MB Cache SATA 6.0Gb/s
Asus DRW-24B1ST 24X
a c 138 à CPUs
a c 241 K Overclocking
November 8, 2012 4:39:23 AM

back to old firefox or version 12/15 ( the latest FF is Firefox 17.0 Beta 4) disable update or Try to disable hardware acceleration in Firefox :
Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
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November 8, 2012 10:09:49 AM

I dont think your stable. I usually get artifacts when my gpu aint stable. so try adding a few more voltages or decrease your cpu by 50-100 mhz
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November 8, 2012 4:11:03 PM

I upped the voltage and I am currently running prime95 (so far for the last 3 hours) I'll continue to run it and see if it crashes or not. I'm currently at 1.472 volts according to cpu-z but have my bios set to 1.5.

Edit: I was, also, able to complete a 3dmark11 test and got a rating of X2009.
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November 8, 2012 11:20:52 PM

Check your vdroop while running prime95...I have to get my 965 up to 1.525v - 1.536v before it is stable at 4.1 GHz to 4.2 GHz...I have run it as high as 4.42 GHz at 1.56v while gaming...and 4.31 GHz @ 1.56v prime95 stable...If while running prime95 you are experiencing a lot of vdroop go into BIOS and set LLC to either enable or if you have the option set it to extreme it will limit vdroop...I use CPU-Z to monitor CPU voltages..I am running H2O to cool it ...watch them temps...DANGER: REMEMBER USE OF THESE VOLTAGES IS EXTREME
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November 9, 2012 1:14:30 AM

lowjack989 said:
Check your vdroop while running prime95...I have to get my 965 up to 1.525v - 1.536v before it is stable at 4.1 GHz to 4.2 GHz...I have run it as high as 4.42 GHz at 1.56v while gaming...and 4.31 GHz @ 1.56v prime95 stable...If while running prime95 you are experiencing a lot of vdroop go into BIOS and set LLC to either enable or if you have the option set it to extreme it will limit vdroop...I use CPU-Z to monitor CPU voltages..I am running H2O to cool it ...watch them temps...DANGER: REMEMBER USE OF THESE VOLTAGES IS EXTREME


Hey, what's interesting is that my voltage is actually higher (according to cpu-z) than I set it in the bios.... I have it set to 1.455 and cpu-z reads 1.48. I don't want to push it much further because I'm already at 60c. I brought it back down to 4.0mhz and I'll see if it's stable there at 1.48v according to cpu-z.
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November 9, 2012 1:19:56 AM

1.48v sounds about right for 4 GHz and my MOBO does the same thing as yours...I just compensate for it
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November 15, 2012 11:16:04 PM

Best answer selected by Barotrauma.
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November 15, 2012 11:17:48 PM

lowjack989 said:
1.48v sounds about right for 4 GHz and my MOBO does the same thing as yours...I just compensate for it


I was able to get a stable clock @4.1mhz (12 hours of prime95) by upping the voltage in bios to 1.450500 which reads at 1.48ish in cpu-z. Thanks.
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