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Old 12-30-09, 04:07 AM   #24
ttsiodras
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Join Date: Dec 2009
Posts: 11
Default Re: 260GTX nvidia-drivers-190.42-r3 - powermizer issue

Here's a screenshot showing the problem:



Notice that my GT240/GDDR5 runs glxgears at around 4700 fps (which is very slow for this kind of chip), and that even though I run an OpenGL app, powermizer still doesn't use the 1.7GHz mode...

The same applies to CUDA code, like nbody:

Code:
Under Linux:
./nbody -benchmark -n=30000
Run "nbody -benchmark [-n=<numBodies>]" to measure perfomance.
30000 bodies, total time for 100 iterations: 19701.262 ms
= 4.568 billion interactions per second
= 91.365 GFLOP/s at 20 flops per interaction

Under Windows XP:
Run "nbody -benchmark [-n=<numBodies>]" to measure perfomance.
30000 bodies, total time for 100 iterations: 12137.919 ms
= 7.415 billion interactions per second
= 148.296 GFLOP/s at 20 flops per interaction
I verified (via GPU-Z) that under Windows XP, the card uses the 1.7GHz mode.

This is definitely a Linux driver bug, that affects cards with GT240/GDDR5 - maybe others, too...
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