It all depends on how much you've got to spend.
The Intel I Series are very good, but they are very expensive. The cheapest dual core I3 Ivybridge processor is around £100.
Comparing that to an AMD FM2 A8 5600K Quad Core, costs £80. The 5600K is faster, and the on chip Radeon graphics are more then double the performance of Intel's cheapest I3 processor.
You may actually be financially better off, to buy a new computer/tower. The reason being is that recent motherboards dont have IDE support for old hard drives and DVD drives, require different power supply connections. The only thing compatible would possibly be the case.



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