I thought I'd add my Slimline 3150 upgrades to the list.
CPU from Core 2 Duo E6320 to Core 2 Extreme X6800
Memory from 2Gb of DDR2 to 4Gb Corsair XMS PC6400
HDD from 250Gb Samsung to Intel X25-M 160Gb
Everything worked fine with no issues, sadly I only see 3.5Gb in Windows 7 x64, I...