The phoronix test suite is a good profiler, at least it would narrow the search. But, as you observed, once you are down to the RAM and integrated devices what options do you really have expect to toss the mobo?

"Major Cache of Fossils Unearthed In Los Angeles "

what, not the RIAA????

I suggest, based on my own recent experience, that you run up Centos 5.2, update the installation, then install Virtualmin GPL. None of this will cost a cent, it is all very high quality software with strong community support. This has enabled me to manage a web hosting server in a secure, efficient manner with very low effort. If you want experience I suggest you pursue GOOD experience, anyone can run up XP and wish they hadn't.