CPU Upgrade.
My Games machine has a socket 939 motherboard. It'll take an Athlon 64 X2, or an Opteron.
http://global.shuttle.com/Support/SupportList.asp?Item=SN25P&ver=SN25P%20(FN25V1.x,V2.x Tom's Hardware doesn't even mention Opteron's in their CPU comparison.
http://images.tomshardware.com/2007/07/16/cpu_charts_2007/cpu_table_amd_big.png Anybody know anything?
(I suspect that, in the end, the limiting factor's going to be my ability to source an appropriate CPU.)