I just ordered one of these:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814150330
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The things I looked at was
<TABLE class=specification cellSpacing=0 cellPadding=0><TBODY><TR><TD class=name>Memory Clock</TD><TD class=desc>2300MHz</TD></TR><TR><TD class=name>Memory Size</TD><TD class=desc>896MB</TD></TR><TR><TD class=name>Memory Interface</TD><TD class=desc> 448-bit
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448 Bit interface should make for good bandwidith. bandwidth = bits X speed (think of an interstate, # of lanes X speed of cars). I don't know what speed it is running at for sure but I would guess it runs at the Memory clock speed.
Bandwidth is how fast the stuff (textures) stored in memory can get to the graphic processors.
896mb of Memory, this will be how much graphic memory can be loaded on to card waiting to go to the graphic processors. This will determine the max resolution you can run on a monitor. More memory should help keep FSX running smooth in higher resolutions, but without tweaking FSX it will only utilize a certain amount of the memory.
72 Texture filtering units, Nvidia puts more of these in their cards than ATI does. I would assume this will speed up how fast textures will load in the game which is a big issue for me with my current 8800gt.
Anyway, I should get the card next week and will find out how well it runs. The only tweak on my current system is to Bufferpools as I recall. I greatly increased the amount of memory buffer being used and noticed it takes longer for plane textures to load and be drawn, but once it does it runs smooth as silk. It does the same with clouds too.