Interesting,Can you tell me what your i5 2500k was Clocked at? I'm thinking of upgrading to a i7 2600k. Right now I'm running a Quad core 9650@4.1 GHz, 8gig DDR2 Ram and a GTX580.
The only time I get really bad stutters is when flying tree top level,to compensate I turn off Grass and turn down Shading.I can't live without Cockpit Shadows