So I'm new to the upgrading scene and have decided to see just how much performance I can extract from my Dell 8400 before building my first comp. With the memory slots filled to the brim, new power supply, and a RAID 0 configuration in the works, I want to know if it is worth the time/money/risk to upgrade to the Intel extreme edition (model 670 - 3.8GHz and such). I'm thinking I can nab one for under 130 and it's the best i can get for the intel 925x chipset. Currently I have installed a 530: P4 3.0G
Also, I currently have an 8600GT GPU installed and I've heard that my CPU, given its age, may actually bottleneck my graphics performance. Once I have the memory and Raid controller in place, where I can find more information on testing and alleviating bottlenecks?