I'm due a processor upgrade, my current is not able to keep up with games as well as I hope and it's my mightiest set-back. I'll list my current setup below:
CPU: AMD Athlon II X4 635 GPU:NVIDIA GeForce GT 440 1GB PSU: Novatech PowerStation Gaming 600W Silent ATX2 Modular Power Supply MOBO:FOXCONN A74ML 3.0/A74ML-K 3.0 RAM:DDR3 Dual-channel 2x2GB (Can't gather more info) Hard Drive: Samsung HD502HJ 500 GB SATA Hard Disk Drive My fans are all Stock.
You need a better graphics card not a better processor to improve gaming performance. A new CPU even an i5 3570K overclocked to 4.5GHz will not improve gaming performance by the smallest amount without a new graphics card.