I've got the following system and frankly it can't keep up anymore, much as it's lasted me well in the 7 years since I built it:
AMD Phenom II X4 955
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16GB Crucial Ballistix Sport DDR3 RAM
Geforce GTX 570
Samsung EVO 850 2GB SSD
Corsair TX-650W PSU
Cooling is a Titan Fenrir Evo, plus...