Need advice for building a new system

im about to build a new system but im not sure which corsair psu to choose between 620w, 750w or 850w
but most likely, this will be the parts for now and i'll be completing all the fans of the antec 902 case while planning to sli my gpu in the near future..


cpu intel i7-920, 2.66ghz
mobo asus P6T DELUXE
gpu GTX 260 sp 216
DDR3 Corsair dominator ,TR3X6G1600C8D,88820
hd 500gig SEAGATE 16MBcache ST3500418AS
dvdRW samsung sh-s223
CASE ANTEC 902
LCD SAMSUNG 23" (P2370G)

will a 620w psu work? or do i need more than that to supply the 2 gpu in the future considering a lot of fans installed in the antec case?

thanks!

oh i see... you sure a 620w corsair hx series psu cant power it all?

ok i get it..
last question...
so do you think a 750w corsair hx series psu can really do the job even if i do a two gtx275 instead of the two gtx 260's?
what do you think?

im sorry HATCHER you lost me back there..
lets say i'll use Inno3d GTX 275 896mb/448bit ddr3 instead of the gtx 260, will the 750w be enough for it?

yeah it would be enough till bout 285 level

Actually obsidian, the 275 uses more power than the 285.

GTX 285: 204W max
http://www.nvidia.com/object/produ [...] 85_us.html
GTX 275: 219W max
http://www.nvidia.com/object/produ [...] 75_us.html
GTX 260: 182W max
http://www.nvidia.com/object/produ [...] 60_us.html

They are very close to the same power consumption.

The 295 is a dual core so of course it uses alot more power (289W max).

thats weird

its true obsidian, you'll see that gtx 275 is indeed power hungry ^^
but two of it surpasses gtx 295 so what i wanna make sure of is if my 750w can power it all^^

Yes, the 750TX can power SLI GTX 275's. The 850TX gives a little more headroom, but you don't seem worried about that.

Yes, the 750HX is even better than the 750TX. They're both rated at 60A, but the HX is 80 PLUS SILVER Certified so it's more efficient.