Just changed land to high and put cpu back to stock clocks - no noticeable change in fps - still around 45 fps on London free flight (first minute of track - tir turned off, auto pilot on to get repeatable benchmark) - GPU now using nearly 1.5 gb memory - no stutters (Have 2x60gb ssd's in raid array - maybe they are helping as I've not had the microstutters at all).

add 6 planes over London...your FPS will be about 18 :(

FPS in external view is very good - about twice of in cockpit view

I believe GPU is effectively, at this stage of developpement, the most important, because : my new rig is good but i kept my previous GC and i experiance a lot of stutters, and fps is rather poor...
Gigabyte X58 UD3R, i 7 950 OC @ 3,22 Ghz, 12 Go @ 1600 Mhz, SSD OCZ Vertex 2 120 Go, and "only" Sapphire HD 4870 2 Go OC @ 780 Mhz core and 1090 Mhz vRAM.

Repeated my test (London sightseeing spit) with CPU clocked down to 2.66 ghz - lost 5 fps compared to 4.6 ghz test - will have to try similar tests ith track of London bombing mission to see ho CU affects things whenthere re muliple planes -bt with just 1 plane CPU is not critical (difference between 38fps and 43fps is not noticeable) - also no stutters (but then I have not sufered from that at all so far - probably as my GPU has 1.5 gb vram).

Thank you 15JG52_Brauer for posting the GPU-Z information, this made the difference!

Some more information on this post:
http://forum.1cpublishing.eu/showthread.php?t=20438

~S~