So I'm very new to building and working on computers. I recently have decided to upgrade my processor. I have a crappy eMachine which I have gutted and rebuilt except for the processor. From what I was told, my motherboard supported the AMD Athlon XP X2 5600+ Dual-Core 2.8 GHz Windsor core. I ordered the processor but was sent the AMD Athlon 64 X2 5600+ Processor 2.9 GHz. Will this make much of a difference? It is the same socket size and everything. However, I don't know if the fact that it is a Brisbane core and not a Windsor will make it not work. Any advice?