What RAM setup works best?

asus a8n sli-premium
fx-57
2x 7800 gtx in sli
seasonic sli 600w psu
2x 74 gb raptors

that's the build. i'm going with corsair xms pc 3200

but i'm not sure what will perforn best

2x 256

1x 512

2x 512

1x 1024

2x 1024

4x 512

1x 2048 (if they make it)

2x 1024 & 2x 512

4x 1024

2x 2048 (if they make it)

all duel channel of course

which setup gives the best performance?

1st) 1x512 and 1x1024 isnt dual channel and 2nd) the amount of ram you have isnt everything. you wanna make sure that you get some nice ram, if your overclocking, some ram that will get some high mhz, and if your not, get some low latency ram. i think most people would agree to get 2x512 if you want fast fast ram, or 2x1024 if you want alot of ram and you play battlefield 2 and new upcoming games. to be honest, 2x512 is good enough, just make sure you get some good ram. look for 2-2-2 ratings

EDIT: for that pc your building right there, get 2 gigs of ram (2x1024). make sure you get low latency ram though

i know the single sticks aren't dual channel, i just threw them in there for comparison
all the ram is corsair xms extra low-latency w/ great timings
i heard that 4x 512 was faster than 2x 1024 so i am not sure what to get
or would 4x 1024 be best for Doom 3, Half-Life 2, and UT2K4

with the nforce 4 chipset its hard to get all 4 sticks with such low latency at 1t. sure, you could go to 2t but take a huge performance hit. i suppose i dont know much about it, i only know what i read. i know about 2x512.. whatever you decide would be fine.. you dont need more then 2 gigs for sure, and dont go less them 1 gig. get 2 sticks no matter what. other then that, its up for you to decide

ok its either 4x 512 or 2x 1024, 4x 512 is supposedly a little faster

what were you saying about 1t and 2t?