So it looks like my motherboard supports 3 DIMM’s if they’re 266mhz or 333mhz, but only 2 if they’re 400mhz. Now I’d still love to know how the hell this update hosed my BIOS, as most times I’ve installed RAM that didn’t work in a system, it would just beep at me and either refuse to boot or refuse to recognize the RAM.
Still, for a 3 year old system, this is quite possibly the best machine I’ve ever built and used.