Originally Posted by vix
If your board can handle 450 FSB, you can probably hit 4.050 GHz with a E8400 and your existing setup. (9*450) Expecting to hit 4 GHz with a 65nm quad is a pipe dream. NOT going to happen.
The limiting factor in your setup will be your motherboard. As stated earlier, the nVidia boards aren't known to be real friendly at higher FSB speeds. With your current video card, you'd probably be ok with either a P35 or X38 board as long as you limited yourself to a single video card. If you plan to to SLI later, I'd stick with nVidia and eat a little in possible CPU performance.
Or get X48 and u can SLI or Crossfire
Also, heres my true opinion on all PC parts.
The one thing that runs everything else is your motherboard, it also decides what you can and cant run, its the most important part and biggest decision when buying a computer, Hence it should be the best part in your system.
Id go for the X48 even if it costs you $100 more than u planned, atleast you will have something that much better, and wont have to upgrade for that much longer