How can I test my GPU memory/RAM?

Solution 1:

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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