I know I can get the compute capabilty by just visiting this official cuda page, or this wiki page.
But I dont know how I am supposed to find the sm of my card.
Is this short for shader model? or shared memory? or none of them?
How to know about compute capability and sm of the Graphics card
cudanvidia-graphics-card
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I personally use EVGA Precision to down clock my gt335 to play older games (DX9 issue on the m11x). However I suspect that you may have more luck with a simple driver update. That card is a little old so if problems persist it is definitely worth an upgrade, 30-50 bucks can give you a 2-3x preformance increase.
GPU stress tests are generally designed to attempt to overheat the GPU. Depending on the particular test, this might or might not use the entire video memory or check its integrity at some point.
Video Memory stress Test is specifically designed for this purpose, and it's quite similar to MemTest86+. You can test the memory using DirectX, CUDA or OpenGL.
The downloadable zip contains VMT (for Windows) and VMTCE (Clean Environment, bootable ISO). There's also a floppy version.
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Best Answer
You should just use your compute capability from the page you linked to. For example, if your compute capability is 6.1 us sm_61 and compute_61.
SM stands for "streaming multiprocessor". The arguments are set in this confusing looking way because they are used as arguments for nvcc where the compute_XX sets the architecture for a virtual (intermediate) code representation and sm_XX sets the architecture for the real representation. Unless you have a good reason, you should set both of these to the same thing.