GPU Testing Tool?

Is it possible to test a GPU? I'm thinking of something like a memtest equivalent.

My graphics card stopped outputting a clean image via the VGA port a while back, so I took it off my KVM and switched to the DVI port, where it seemed to work just fine. However, since I upgraded to Windows 10, I have been getting random black screens that require a hard reboot, and it usually seems to occur when playing a DirectX game. I'd like to isolate whether the issue could be my GPU or something else, perhaps driver related.


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