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Old 08-16-11, 11:53 AM   #52
zander
NVIDIA Corporation
 
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Join Date: Aug 2002
Posts: 3,740
Default Re: [270.18] Overclocking is _still_ broken for 8xxx (probably 9xxx too) class GPUs

I took some time this morning to track down a G80-based card and was able to reproduce the problem.

The driver rejects the increased "core" clock frequency because the frequency of a related domain doesn't meet a ratio requirement in a path that sanity-checks incoming clock frequencies. This is due to a bug in one of the associated control calls. If the "core" clock frequency is increased in small increments, this bug can be worked around to a certain degree, as you discovered.

I tested a fix locally and will try to get it into an upcoming 28x.xx driver release. They say Better late than never, but I imagine that's bitter-sweet in this case. At the risk of sounding insincere, I do apologize for the terrible turn-around time.
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