I am waiting to upgrade my cluster with new AMD Processors, Quad core Phenom X4. My boards are all AM2 slots and I wonder if I could simply plug the new CPU's in. If so I will have 16 cores in my hands. If not I will have to shell out money for two motherboards.
ISA Hardware published these prices. Does not look bad for Quads.
click on image to enlarge
HD9600WCGDBOX CPU Desktop Phenom X4 9600 (4MB,95W,AM2) box $278.00
HD9700XAGDBOX CPU Desktop Phenom X4 9700 (4MB,125W,AM2) box $288.00