Best upgrade for performance-processor, video card or memory?

What can I upgrade to increase frame-rate for MS FSX (flight simulator)? When running FSX, I can’t get the frame-rate over 20 with all the sliders set past 75%. I’m running the resolution at a maximum of 2560 X 1600. My goal is to do whatever I can to increase frame-rate. The CPU temperature runs between 68 and 90 degrees during game play.
I’ve considered adding memory, changing video cards and/or changing the processor to i7. I’ve also considered a different cooling solution, but don’t know where to start. I would appreciate any suggestions.

Existing system:
Asus Maximus Extreme motherboard.
4 x 1 GB (4 GB) OCZ Titanium 240-pin DDR3 SDRAM1600 Dual Channel memory.
An Intel Core 2 Q6700 Kentsfield 2.66 GHz 2 x 4 MB L2 Cache LGA 775 Processor.
Two Diamond Viper ATI Radeon HD 2900 XT PCIE 1GB GDDR4 Video Cards running in Crossfire mode.
Asus Arctic Square CPU Cooler and an auxiliary fan.
3 answers Last reply
More about best upgrade performance processor video card memory
  1. Memory is fine. You could most likely get away with replacing the graphics cards with 2 ATI 4850 or 4870's to increase the frame right. Alos, 467x series are going quite cheap right now, so 2 of those would also provide you with increased frame rates. Your CPU temp hits around 90? That seems a bit high...
  2. I agree with Memory
  3. if you are running a 32 bit OS don't waste your time or money on Memory
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