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OC suddenly unstable, help please

post #1 of 5
Thread Starter 
TLDR version up front: I've been running 4.5GHz/1.3v for about 4 months with no issues whatsoever. Not a single blue screen, every instance of p95, OCCT, etc has run fine. In fact I haven't had anything crash except the display driver when I pushed my gpu a little too high. Today I somehow lost that stability. Even at 1.4v I can't pass 60 seconds of p95.


Slightly longer version with the events prior to instability:

Ok so I finally got a startup WC loop and got it all installed last night. Leak tested for a few hours, no issues, so I figure I'm ok to let it run over night. Now I'm all happy I have better cooling and can start pushing things a bit further. I ran p95 about 10 hours over night, no errors and temps hit 60. Today I ran F@H for about 8 hours, again apparently without issue. This evening I was working on GPU OC. I ran a few Heaven, 3DMark 06 and 3DMark 11. Somewhat disappointingly I had a driver crash at 950 core so I scaled it back to 925, restarted and ran a few more benches without issue. For some reason or another I decided to run p95 again and immediately got errors, within 60 seconds. Yikes. Went into bios and bumped VCore incrementally all the way to 1.4v and still can't get past 60 sec of p95.

Because I know you'll ask, in my previous "stable" configuration I only changed multi and Vcore and disabled turbo. I have also read all the stickies and used that knowledge to the best of my ability, however limited that may be.

Thanks in advance for the support.
post #2 of 5
In my personal experience once the GPU drivers crash for that entire session until you restart the system will be unstable.

Now you've restarted it and changed bios settings so that would've fixed any problems unless you you still have the GPU setting on boot. My suggestion would be try to run memtest and some HDD tests, even though it's unlikely they've gone bad I've known stranger things.

Of course this all assumes you were 100% stable before, 24h on prime stable is my minimum for calling something stable but everyone has their own opinions.
Ada
(24 items)
 
Aegis
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CPUMotherboardGraphicsRAM
AMD 1700 Gigabyte AB350 Gaming 3 EVGA GTX 980 ti Classified F4-3600C16D-16GTZ @3200 
Hard DriveHard DriveHard DriveHard Drive
Intel 520 120GB SSD Samsung F2 1TB X2 Samsung F4 2TB Hitachi 1TB X2 
Hard DriveOptical DriveCoolingCooling
Seagate 3 TB Pioneer BDR 2207 Noctua NH D14 Sunbeam Rheobus Extreme 
CoolingOSMonitorMonitor
Enermax 140mm T.B. Vegas Duo x2 Win 10 Pro Extreme Edition Catleap 2B  ASUS VH242H  
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Logitech mk260 NZXT Hale90 750 Fractal Design Arc Midi Logitech G9x 
Mouse PadAudioAudioAudio
Steelseries QcK Denon AH D2000 Harman Kardon AVR 2600 Polk RTi8s, Rti4s and CSi3 
CPUMotherboardGraphicsRAM
Intel G645 Asrock z77 Extreme 4 Nvidia Branded GTX 460 SLI 8GB Corsair Vengeance Low profile DDR3 1600 
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Hitachi 1TB Windows 7 Antec HCG 750 Bitfenix Shinobi Window 
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Diablo 3 Steel Series.  
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Ada
(24 items)
 
Aegis
(9 items)
 
 
CPUMotherboardGraphicsRAM
AMD 1700 Gigabyte AB350 Gaming 3 EVGA GTX 980 ti Classified F4-3600C16D-16GTZ @3200 
Hard DriveHard DriveHard DriveHard Drive
Intel 520 120GB SSD Samsung F2 1TB X2 Samsung F4 2TB Hitachi 1TB X2 
Hard DriveOptical DriveCoolingCooling
Seagate 3 TB Pioneer BDR 2207 Noctua NH D14 Sunbeam Rheobus Extreme 
CoolingOSMonitorMonitor
Enermax 140mm T.B. Vegas Duo x2 Win 10 Pro Extreme Edition Catleap 2B  ASUS VH242H  
KeyboardPowerCaseMouse
Logitech mk260 NZXT Hale90 750 Fractal Design Arc Midi Logitech G9x 
Mouse PadAudioAudioAudio
Steelseries QcK Denon AH D2000 Harman Kardon AVR 2600 Polk RTi8s, Rti4s and CSi3 
CPUMotherboardGraphicsRAM
Intel G645 Asrock z77 Extreme 4 Nvidia Branded GTX 460 SLI 8GB Corsair Vengeance Low profile DDR3 1600 
Hard DriveOSPowerCase
Hitachi 1TB Windows 7 Antec HCG 750 Bitfenix Shinobi Window 
Mouse Pad
Diablo 3 Steel Series.  
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post #3 of 5
You mentioned disabling turbo, did you play with your hyperthreading settings at all?
 
F@H
(14 items)
 
 
CPUMotherboardGraphicsRAM
Core i7 920 @ 4.0ghz EVGA x58 132-BL-E758-A1 2x EVGA 460 1 GB G.SKILL 3 x 2 GB 
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Mushkin 40 GB SSD / WD Black 1 TB Windows 7 Home Premium 64-bit DCLCD 20.1" Logitech G15 
PowerCaseMouse
Antec TP 750 Antec 900 Logitech G5 
CPUMotherboardRAMCooling
i7 2700k ASUS Maximus Gene-Z z68 G.Skill 2133mhz Noctua NH-D14 
OSPowerCase
Ubuntu 10.10 BFG 650 Silverstone TJ08-E 
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F@H
(14 items)
 
 
CPUMotherboardGraphicsRAM
Core i7 920 @ 4.0ghz EVGA x58 132-BL-E758-A1 2x EVGA 460 1 GB G.SKILL 3 x 2 GB 
Hard DriveOSMonitorKeyboard
Mushkin 40 GB SSD / WD Black 1 TB Windows 7 Home Premium 64-bit DCLCD 20.1" Logitech G15 
PowerCaseMouse
Antec TP 750 Antec 900 Logitech G5 
CPUMotherboardRAMCooling
i7 2700k ASUS Maximus Gene-Z z68 G.Skill 2133mhz Noctua NH-D14 
OSPowerCase
Ubuntu 10.10 BFG 650 Silverstone TJ08-E 
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post #4 of 5
While unlikely, it could also be that you have degraded the chip a bit with your previous OC.

Instead of increasing vcore and causing any further issues, just for the sake of troubleshooting try to restore defaults and run at stock speeds. Run some benches and stress tests to see if you BSOD.

If you BSOD, grab the error code and post it. If you're stable, try to slowly increase your OC (slow, just up your multi a couple notches, and if you're unstable then your vcore a couple notches). You could also try reducing the CPU PLL voltage from its stock to 1.5-1.6ish volts as that may help with stability.
post #5 of 5
Thread Starter 
@Junkboy I restored bios to default and only changed the settings I knew worked, and restarted several times now. I haven't tried booting with the gpu at stock, would that make a difference on cpu stability? I've also not had any bsod. Haven't run p95 for 24hrs before but up until a few weeks ago I folded bigadv for days at a time no problems.

@stu HT is enabled, haven't touched anything related to it that I'm aware of.

@stone I thought degradation could be a factor but I also didn't think I was pushing it very hard before. I had it "stable" at 4.9 a few months ago but temps were a bit higher than I was comfortable with so I backed it off. I'm back at stock for now and will try to get it back to a reasonable OC today, if I do happen to bsod I'll post some codes.

Thanks guys, we'll see what happens.
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