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7970 OC help

post #1 of 4
Thread Starter 
Hi,

I just got a Sapphire 7970 OC Boost. Voltage appears to be unlocked. I've been successful overclocking on stock volts of about 1.08 from 950 to 1100 mhz. I think 1125 is even possible at stock, but not sure about the stability. I've even upped the vddc slightly to get 1180. All of this is on air with temps around 70-73 load in Heaven and Valley. I haven't tried the memory past 1500.

This the point is where I run into a problem that I haven't seen anywhere before.

If Heaven or Valley show glitches (flickering triangles), then they stay that way. Even if I close the program, take everything back to stock and reload them. Another oddity is if I glitch one, the other one will work fine until I glitch that too. This will only be fixed if I restart my pc.

I've been using Trixx, and I have a feeling there's something fishy going on with it or the card. It seems like the card is doing one thing, and Trixx and GPU-Z are showing something different. Which still doesn't explain why a benchmark will be messed up until I restart...

Please let me know if anyone has any ideas about what is going on or how to fix it. Thanks!!!
post #2 of 4
I've gotten the same odd behavior using crysis to test OCs. Gets messed up and doesnt fix until a reboot. Honestly i wouldnt worry about it as it doesnt seem as though it would be a hardware problem since its fine after a reboot. Probably some funky software thing. I've never had problems ignoring that, just reboot.
    
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I7 4790k 4.7ghz Asrock Z97 Extreme4 Gigabyte G1 GTX 970 SLI @ 1590Mhz Gigabyte G1 GTX 970 SLI @ 1590Mhz 
RAMHard DriveHard DriveHard Drive
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post #3 of 4
Quote:
Originally Posted by pmpysz View Post

Hi,

I just got a Sapphire 7970 OC Boost. Voltage appears to be unlocked. I've been successful overclocking on stock volts of about 1.08 from 950 to 1100 mhz. I think 1125 is even possible at stock, but not sure about the stability. I've even upped the vddc slightly to get 1180. All of this is on air with temps around 70-73 load in Heaven and Valley. I haven't tried the memory past 1500.

This the point is where I run into a problem that I haven't seen anywhere before.

If Heaven or Valley show glitches (flickering triangles), then they stay that way. Even if I close the program, take everything back to stock and reload them. Another oddity is if I glitch one, the other one will work fine until I glitch that too. This will only be fixed if I restart my pc.

I've been using Trixx, and I have a feeling there's something fishy going on with it or the card. It seems like the card is doing one thing, and Trixx and GPU-Z are showing something different. Which still doesn't explain why a benchmark will be messed up until I restart...

Please let me know if anyone has any ideas about what is going on or how to fix it. Thanks!!!

This is USUALLY caused by VPU recovery, although not always, but that's usually the culprit (recovery after an unstable OC). In any event, you can recover much faster by just going into S3 sleep mode and reawaken the computer again, since that basically resets the video card as if it were powered down and back up. Much faster than a restart(maybe windows 8 with uefi can restart as fast, though). S1 might do it too.
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post #4 of 4
Thread Starter 
Ahhhhh, good idea....

I did try something last night that makes me think it's the card's bios. I switched from the 950mhz to the 1000mhz bios with the onboard switch. Then proceed to attempt to overclock. I could have Heaven running, set the clockspeed to 1200, and get minimal artifacting, then change it back or raise voltage to make it go away. No more massive triangle nonsense. So I think my 950mhz bios is responsible in some way. Maybe VPU recovery is part of that bios or broken on it. I don't know much about it.
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