Thanks RayBay and Rage_3K_Moiz, advice taken, and I'll be wary of it - I'm even unplugging most of the USB peripherals when I'm not using them for that very reason. If the PC lasts another year I'll be impressed anyway - didn't really expect this PC to last as long as it has without any major issues. The X1300 card was under $60, the PSU I can't even remember what I paid for that - less than the card anyway, so the risk vs reward is acceptable for me. I back up regularly on an external drive any important docs as well, and if it does melt down, it's a good excuse to upgrade. Been looking at the Dell XPS 630 or 730x for a while now..