Power management bug affects other NVIDIA GPUs Not only the GTX 285; not fixed in Snow Leopard


users of the GTX 285 have been complaining about a power management issue in OS X that prevents the GPU from running at full speed for CUDA apps.

I just found out this also happens to the GeForce 9600M GT.

Under normal use the 9600 runs at 0.34 GHz, and at that clock pinned device to host copies are around 1.5 GB/s.
Running some OpenGL code makes the clock go up to 1.25 GHz, and pinned copies double to 3.0 GB/s.

Happens on Snow Leopard too.

And how to fix this?

Read this post http://forums.nvidia.com/index.php?showtopic=106083

Looks like it’s no bug after all, but a feature (and a good one in my opinion).

It just makes profiling CUDA code harder - that’s all.