I was wondering would it be worth it to upgrade the CPU in my HP Pavillion a1130n motherboard from a Socket 939 AMD 64 3500+ Venice CPU to a FX-55 San Diego? The motherboard is the MSI Ms -7093. I have a budget of only $200 and don't overclock. Would I notice a significant difference in speed? I've seen the FX-55 on sale for less than $200 on ebay.