Just a few quick pointers:
- The socket is the connector between motherboard and processor. They both need to be the same. Choose whichever your processor needs.
- The dual core processors are single items. They do not come in pairs. The "dual" nature is inside, they contain 2 separate processing units. In theory this doubles the computing power while still using a single chip.
Ofcourse you can go for a dual processor system in which case you will need 2 processors of the same type (not sure about same clockspeed).
The absolute best is dualprocessor/dual core resulting in 4 times the computing power.
However: Most programs can only run in a single thread, which means that they're not suitable to divide over multiple processing units (cpu or cpu-cores).
So if you're looking to improve gaming performance, dual-cpu or dual-core is not going to help, they're not designed to make use of multiple cores/cpu's.
Only specifically choose for the multiple cores/cpus system if you have needs for multiple heavy tasks simultaneously or you run software that can use the extra power efficiently.
Then again, if the price is right, extra processing power won't hurt!
As for 64-bit, once again if the price is right go for it! the AMD 64-bit chips run your current software with incredible speeds (there is no emulation involved, it runs the old code as if it were a fast 32bit cpu). You can safely go with the AMD 64 bit processors.
I hope this clears somethings up.
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