I picked up a used Xeon W3690 CPU from eBay to upgrade the Core i7-930 currently powering my computer. Browsing around eBay, I found several for under $80. For two extra cores and a few hundred more MHz, it seemed like a pretty good deal to me so I picked one of them and bought it.
The existing CPU still works fine, but after seeing a few friends talking about computer upgrades, I did a bit of research to see what I could put into mine to give it a bit of a boost without having to do a complete computer replacement.
Doing my quasi-semi-annual computer cleaning and replacing the CPU will be a good weekend project. With luck, this computer will be up and running with a “new” and faster brain.