need some suggestions!

At the risk of beating a dead horse, I re-installed my C-130 X into my
FSX and it's no better on framerates, not that it should have been I was wishful.

What can I do to achieve better than 8.0 - 9.5 fps in vc maybe 10 at
altitude w/clear skys and 12-14 in exterior view.
This is over the Arizona desert mid-day zero AI traffic etc.

I read several posts with  users with similar systems to mine and they claim to be getting 20 fps ??    

I really want to get some use out of the herc, but it is like a slow motion film

Here are some specs:

Core 2 duo 6600 , Nvidia 8800GTX OC
FSX (SP-1) with UTX/GEX/SceneryTech LC
4 gigs Ram
single use PC no Network
samsung 25" WS monitor 1900x1200
Windows XP media version (SP2)

FSX:  autogen= sparse
no AI traffiic
water at 2x1
clouds medium density
radius medium
Frames locked at 28 fps ,runs better for me than unlimited

AA set on Video card at 8
in game trilinear


not really pushing the sim...

If I need to shut off start up programs or sevices what are some that have a pronounce effect on sim performance and can be safely
turned off?

My AV is AVG 8.0 and many features are turned off

Is a quad core over 3.0 ghz the only answer?

suggestions needed

Thanks so much

Doug