RAM clock down with 4 DIMMs

[joejones]

putting together a new high end computer.

I have a nForce 680i SLI MOBO
2 8800 GTXs
Extreme QX6700 quad core

Will 4 GB of high performance RAM "down clock" if I use a 4 x 1 GB configuration.

Of these options, which would give the best performance, regardless of cost?

(1) 4 x 1 GB CORSAIR XMS2 DOMINATOR
TWIN2X2048-9136C5D* XMS2-9136 2048MB 5-5-5-15 2X240DIMM
or

(2) 4 x 1GB CORSAIR XMS2 DOMINATOR
TWIN2X2048-8888C4DF* XMS2-8888 2048MB 4-4-4-12 2X240DIMM
or

(3) 2 x 1GB CORSAIR XMS2 DOMINATOR
TWIN2X2048-8888C4DF* XMS2-8888 2048MB 4-4-4-12 2X240DIMM
?down clock with 4 DIMMs worse than with only 2?
or

(4) 4 x 1 GB CORSAIR XMS2 DOMINATOR
TWIN2X2048-6400C3DF* XMS2-6400 2048MB 3-4-3-9 2X240DIMM

or another combo of Corsair not listed....

I've been reading that despite common sense, sometimes more is not better. If the clock speed is too high and you use 4 DIMMs, will it down clock and end up overall worse performance than if you just stuck with the higher clock speed and 2 GB.
Thanks

I will be running Vista 32, photoshop C2, action games.

 

[akhilles]

IIRC, the clock-down happens to 4 double-sided sticks on an nVidia s939 mobo. Going from 400mhz to 333mhz. I haven't heard of it on the 775 platform. Def. doesn't happen to my buddy's evga 680i 4gig pc.