all 939 CPU's. You need to research more info on the specific mobo to see the CPU limit. If all things are compatible then simply replacing the CPU is all that should be required.
However, it is likely that a BIOS update would be needed to make any significant improvment. Remember that the new AMD CPU"s now use DDR2.
You probably have a fine performing computer and any meaningful upgrade would simply be a new computer.
I was considering upgrading my AMD 3200+ to something better, possibly a dual core. A few questions: How difficult is it? What are the basic steps? Does it require a fresh Windows install? This is for an Emachines 6212. Thanks for any help, I really appreciate it!