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What is the best method for find a max overclock for a gpu?

post #1 of 14
Thread Starter 
Just curious what the best way to find a gpus max is. I have 2 6970's in crossfire and i just installed the latest afterburner. my cards are stock 925/1425 and right now im running kombustor with my clocks 950/1425 stock voltage still in windowed mode, so it is only stressing gpu2 at the moment.

Should i find the max for one then try both? and start with core then memory? and how long should i let kombustor run between each testing phase?
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post #2 of 14
keep going until you find it? lol and you should probs find the max for both of them, that way you dont push one too much, obviously in CF they will run at the slower speed.
     
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post #3 of 14
I reccomend using MSI Afterburner and in the settings make sure "Sync settings with similar graphics processors" is checked and then start OCing slowly with the core/shader and then the memory. Once your video crashes, you have goone to far. Adjust your setting back down to the last good config and your set.
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post #4 of 14
Thread Starter 
Quote:
Originally Posted by Krymore View Post
I reccomend using MSI Afterburner and in the settings make sure "Sync settings with similar graphics processors" is checked and then start OCing slowly with the core/shader and then the memory. Once your video crashes, you have goone to far. Adjust your setting back down to the last good config and your set.
how long do u think i should let kombustor run in between each clock change? im doing 10 min. 975/1425 now
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post #5 of 14
Kombustor isn't a really good test. When I had an nVidia card, if I was Folding with unstable core clocks the unit would always error out. Not sure about AMD folding since I just got my card a few days ago. Usually the best test is intensive benchmarks and heavy gaming. If you can play Metro 2033 or Crysis for an hour, you're most likely stable.
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post #6 of 14
Thread Starter 
Quote:
Originally Posted by PvtHudson View Post
Kombustor isn't a really good test. When I had an nVidia card, if I was Folding with unstable core clocks the unit would always error out. Not sure about AMD folding since I just got my card a few days ago. Usually the best test is intensive benchmarks and heavy gaming. If you can play Metro 2033 or Crysis for an hour, you're most likely stable.
true but im not going to play crysis for an hour each time i bump the clock up a little bit, would take me several days to find my max lol. When i think i have my final clock ill go play some games for a while to confirm.


1000/1425 now. 1.195v (stock) was not enough, froze 30 seconds in. 1.205 ran for about 4 min, trying 1.210 now

edit: 1.210 made it further but still locked, 1.215 now
Edited by Blindsay - 4/11/11 at 9:08am
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post #7 of 14
Thread Starter 
having trouble getting 1000mhz to lock in. 1.225v now, odd thing i notice is with the past few voltage increases when i run kombustor i noticed my gpu usage is not staying at 100% anymore, currently its at 80%
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post #8 of 14
Quote:
Originally Posted by Blindsay View Post
having trouble getting 1000mhz to lock in. 1.225v now, odd thing i notice is with the past few voltage increases when i run kombustor i noticed my gpu usage is not staying at 100% anymore, currently its at 80%
1. thats alot of volts, and that will degrade your GPU.
2. Overcurrent protection will lower GPU usage/Mhz on the Core when using non realistic stressing programs to stress a GPU over the values of normal applications. Use Furmark 1.9.0 and disable OCP to work past this
post #9 of 14
Thread Starter 
Quote:
Originally Posted by pangeltveit View Post
1. thats alot of volts, and that will degrade your GPU.
2. Overcurrent protection will lower GPU usage/Mhz on the Core when using non realistic stressing programs to stress a GPU over the values of normal applications. Use Furmark 1.9.0 and disable OCP to work past this
stock is 1.195, 1.225 is .03v more

And i found out what the issue was i opened task manager to find my cpu was maxed, apparently each time kombustor was closed due to my video card drive locking and recovering it wasnt actually closing and still running in the background
Edited by Blindsay - 4/11/11 at 9:39am
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post #10 of 14
Overclocking gpu's is more complicated that oc'ing a cpu, there is more than one program you need to use to test stability. First, for core overclocks, the best stability tester is furmark and/or folding. For memory overclocks, I usually run either the metro 2033 benchmark or heaven benchmark at maxed out details, so you stress the memory as much as possible.
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