Not Much
I work at a local computer store...you would probably get about 75-100 for the first and maybe 100-150 for the second, and thats being generous. Considering that we can build this system,
AMD Sempron 3000+
512MB DDR400
160GB Hard Drive
CD-RW Drive
Floppy Drive
Black Keyboard
Black Mouse
Black Case
Windows XP Home
Our cost is about 350 and we sell it for 450.Why would we pay close to that for outdated hardware? Another thing is, we have at least 10-15 used computers in the back of the store at any given time. Old parts generally aren't that valuable. Try ebay.