Have you ever found yourself rummaging through your computer stuff and discovered that you still had those 8 dual core Opterons and 32 sticks of 4GB RAM lying around that you didn't know what to do with?

If you have you should consider getting yourself one of these and one of these.
then bolt them together and build yourself a really rather peppy computer.

It'll look somewhat like what you see on pages 25/26 here.