Have a Dell xps 420 that I use for mostly gaming and have changed the video card and the power supply from the 375 to a 500. Now I would like to see if it's possible to use my older PC to make it faster to play higher end games by changing the cpu. I'm a beginner in this vain and like to tinker with gadgets. So just asking for some advice as I fumble my way through expanding this pc's potential.