Oblivion wrote:found out what's causing it yet?

In brief, it was the motherboard, though I have no clue whether it's failure was caused by undervolting or ground out. Undervolting would have been caused by weak power, and though the box is on a serious PSU behind a heavy-duty UPS, this apartment complex is notorious for power problems - hell, all the lights in the place dim when I fire up the printer, which is *not* on the UPS. Ground out, well, I have carpet, spare parts, dust and cats - this place is a veritable static storm, so I could have easily grounded out the mobo without realizing it. Or some f'd up combo of those two.
The new mobo, a p35-ds3r, is quite nice though lacking a second PCIe x16 for SLI and will allow me a bit of upgrading room for the proc and memory.