And, in a word, No. The most likely cause of spontaneous reboots (resets, really) is bad or incompatible DRAM (quite possibly as a result of memory bus overclocking, including via XMP).
I don't know if that's my case, it really looks like an integrated graphics driver issue from the behavior i'm seeing. system pauses, then the screen blanks for a few seconds and sometimes it recovers and sometimes it reboots. and if i was playing video it displays a blank window.
It is true that there are other possibilities, but I am not convinced. With memory issues like this, what usually happens is the memory bus(es) lock up. This results in the graphics engine starving (since its "VRAM" is a portion of standard DRAM) and the screen goes blank. Eventually, the Watchdog Timer wakes the system up by issuing a system reset.