This article touches on something I've always wondered. Is there anything on these GPUs which prevents a user from addressing random bits of the video memory? Suppose I use "fast user switching" in Mac OS to give the system over to some other user. Does the OS flush the VRAM? Could the other user program the GPU to display random memory addresses as textures? If there are remnants of other people's windows in texture memory, that would be Bad(TM).
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