Following is the fsx.CFG I used for my GigaByte Nvidia GTX285.  Nvidia driver used is 8.17.12.5896 with nHancer 64.2.5.9
Average framerate achieve is 39 on my Dell 30-inch.

[JOBSCHEDULER]
AffinityMask=14     // 14 for last 3 cores — No need setting to 15 for 4 cores
[BufferPools]
PoolSize=1000
RejectThreshold=126976    //124Kb = 126976
[GRAPHICS]
ALLOW_SHADER_30=1 // === Important to assist PoolSize ===
HIGHMEMFIX=1 // Fix errors of black squares around lights whilst panning around
STALE_BUFFER_THRESHOLD=1024 // 1024 in KB
[Display]
TEXTURE_BANDWIDTH_MULT=80
UPPER_FRAMERATE_LIMIT=47
WideViewAspect=True
TextureMaxLoad=12 //Use multiples of 3 ONLY but may induce stutters
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