AMD2800 + and dual-core AMD4800 + can exchange it?

I was the AMD2800 + processor now would like to change or AMD4600 + dual-core processor can AMD4800 + for it?

Not .2800 Should be 754 + .4800 + needle Interface is a 940-pin 940 is on the line Hello, this is not, your motherboard is too old, can not support the dual-core CPU not to change the motherboard ~ ~