Should I upgrade processors?

I recently upgraded my whole entire system from an AMD Athlon X2 platform to an Intel Core 2 Duo series platform because my processor was bottlenecking a new video card I had bought (an XFX Radeon HD 4890)

However, I managed to obtain another Radeon HD 4890 for really, really cheap and now have them in Crossfire X mode in my system.

The performance is fine, it's near what I expected but I'm just wondering if I would gain any performance improvements from upgrading processors, especially from a dual core to a quad core?

System specs
Intel Core 2 Duo E8400 (E0 stepping) clocked @ 3.83GHz (1.25v)
Artic Freezer 7 Pro CPU Cooler
Asus P5Q Pro Turbo Motherboard
4GB G.Skill PC2-8500 DDR2-1066 RAM (5-5-5-15)
2x Radeon HD 4890 1024MB GDDR5 in Crossfire Mode (one is an OC edition, the other is a normal edition, balanced both to reasonable clocks)

Basically what I was thinking of doing was upgrading from an E8400 to a Q6600? Upgrade or downgrade? Otherwise can anyone recommend me a better processor (without changing motherboards) that will give me marginal performance improvements?

The reason I'm asking is because in Grand Theft Auto IV, performance almost didn't change, and I heard that using a quad-core processor helps it a lot.
4 answers Last reply
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  1. ugh, why didin't you upgrade to Sandy Bridge?
  2. With that overclock you should be fine. No real value in putting more money into that rig.
  3. I totally agree with Dfusco, with the right tweaking your E-8400 should run just about anything you can throw @ it...

    I'd save my money for the next great build..
    With Sandy Bridge or newer, SSD drive etc..

    I have an E-8400, E-8600 & I7 860

    hard to judge much difference by seat of the pants use..

  4. Oh alright, and I didn't invest in a Sandy Bridge system, because I managed to get a good deal on all of these components, lets just say I got all of this at under $300, it's pretty good!
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