Well, my triple-GPU machine is off for now. Was having some power fluctuations that were causing reboots, one after another, so it was pointless to keep running F@H, for fear of corrupting something.
I have both of my rigs on APC BE-550R UPSes, but for some reason, my little AMD rig (not overclocked, stock 3800+ single-core on an NV6150 mobo with 2x512MB DDR), keeps running just fine, and the UPS doesn't even click over. My triple-GPU rig (which probably exceeds the 330W that the UPS can handle) clicks over, but then reboots when it does that. It doesn't make any screaming noise like it should if it were overloaded, at least my past 280W UPS did that when I had two computers plugged into it.