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Mavke
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Re:GeForce 9800 GX2 overclocking and any stability testing help? - 2008/08/29 10:45 Boiler wrote:
Just my 2 cents here as I run Quad SLI with 2 rigs, a pair of these GeForce 9800 GX2's from EVGA in one of those and found using any version of ATITool and saw yellow flashes on the test before it reported any error. I think there is a lot of memory chips and tools are not perfect enough yet.
Well as I mentioned before artifacts of memory you can only see with the eye as it doesn't give errors to the application when rendering the triangles and so on, cause it is the memory and not the core which is calculating. When a core is calculating and missing out then the program is able to report that as errors as the calculation goes bad, with the memory it is more frame buffering and if that show dots well in the memory it doesn't know that so you can perfect that, it is perfect you just need to watch yourself.

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Elfvis
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Re:GeForce 9800 GX2 overclocking and any stability testing help? - 2008/08/29 17:31 Yeah I decided that basically you only gain so much performance at a certain point on my GeForce 9800 GX2 card and pushing it for the games I am playing is just not worth the risk of damaging the card. I spent 4-6 hours last night honing the core and memory and basically what I did is I would use a video of the 3DMark06 at default clocks to decide if there were any issues with the new clock. After all the talking here I wasn't amazed that what didn't artifact for over an hour in ATITool did show glitches in the 3DMark06 test.

When I saw the error in the 3DMark06 test I backed the memory up 10MHz and re-ran. I ended up with a very stable clock with 720MHz on the core and 2230MHz on the memory. When I flash this evening I think I am even going to be a little more conservative and run 700/2200MHz.

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Mavke
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Re:GeForce 9800 GX2 overclocking and any stability testing help? - 2008/08/29 20:11 Elfvis wrote:
When I saw the error in the 3DMark06 test I backed the memory up 10MHz and re-ran. I ended up with a very stable clock with 720MHz on the core and 2230MHz on the memory. When I flash this evening I think I am even going to be a little more conservative and run 700/2200MHz.
That is indeed a good idea to keep some save margin cause after long gaming the core and memory could even heat up more than while just running 3DMark06. So best to keep a bit extra margin to be safe.

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DarkFox
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Re:GeForce 9800 GX2 overclocking and any stability testing help? - 2008/08/30 06:27 I usually test for memory errors by playing games. Watching ATITool for long periods is painfully boring, and I keep thinking I see glitches that may or may not have occured. If I play a game and the memory is overclocked too far, the driver often crashes on me, so I keep dropping the clocks until I can play for long periods without errors. It may not be a bullet proof solution, but it's good enough for me.

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Mavke
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Re:GeForce 9800 GX2 overclocking and any stability testing help? - 2008/08/30 11:48 That is exactly how you should do it really, the artifacts coming from the memory will not be spotted as errors until these become so bad they impact as well the GPU rending errors. But before that it might give artifacts and as soon as that happens you should lower the memory clocks as those artifacts mean that after some time leading to permanent damage to the memory chips and then you can throw the card away as it is unrepairable.

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