i am building my first high-end computer, and am not sure what power supply i should get. i need to power two 570's in SLI, a i7-2600k @4ghz, one 200mm fan, five 1200mm fans, and one liquid cooling unit.

is this 750w okay

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139006&nm_mc=EMC-IGNEFL030811&cm_mmc=EMC-IGNEFL030811-_-EMC-030811-Index-_-PowerSupplies-_-17139006-L0A

or do i need something like an 850?

-zackary

EDIT: this?

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=5222602&CatId=2534

Those gpu's use quite a lot of power, I'd get the 850 to be sure. Remember an OC'ed cpu uses more power too.

this http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=6391018&CatId=2534

single rail,acurate voltage output very high efficiency

and btw,and i7 2600 k @ 4ghz is a poor overclock, better 4.6ghz,even 4.8ghz

i can't afford that much on a PSU, $130-140 is all i can do.

-zackary

i can't afford that much on a PSU, $130-140 is all i can do.

-zackary

come one,you're going for 570 sli,i7 2600k and you cant afford a half decent psu for you rig?

if that's true you should reconsider your priorities

cheaping out in a psu is really a bad idea with such a hi-end rig.

its only 70$ more expensive than a "cheap" 140 psu.

7 years warranty says all.

and you'll save money http://www.youtube.com/watch?v=5vnXNyh9vIg&feature=channel_video_title

i guess i could. icluding that psu the whole build will cost my $1,700-1,800, and i have about $900

If you have about 900, why do you consider a SLi 570 in the first place? If you're building a high-end pc, it's very important to have a good base.
That means buying a decent PSU and good cooling. Never save on your PSU.

if psu dies all your other parts can die
NEVER CHEAP OUT ON PSU
ditch the 2600k get the 2500k if puter is for gaming only
but
http://www.newegg.com/Product/Product.aspx?Item=N82E16817207008
would work great
or even
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371050

Dude never ever in life get cheap on psu for gaming pc.You can go for gtx 470 or gtx 580 only.belive me you pc will play games coming in 6 years least.The card mationed above are still high end cards in market.no need of sli if u can't afford psu needed for this power hungry system.i have paid big price for getting cheap power supply for my gaming pc.I had to replace my whole system rig cuz it got burned due to cheap power supply.so i got for corsair vx550.This is my personal experience.You better get better power supply by compromising on sli. I suggest corsair brand.they make heavy duty gaming psu's and rams.plus they have worlds best warranty support of 5 years.if you buy low end psu ,then you will kill yourself cuz that psu will damage hardware parts beyond repair and warranty.so if you and you gaming pc wanna live, get better psu!

i will go with the $200 850w psu. i am going to keep the 2600k, because this pc will have heavy AutoCAD use.

if psu dies all your other parts can die
NEVER CHEAP OUT ON PSU
ditch the 2600k get the 2500k if puter is for gaming only
but
http://www.newegg.com/Product/Product.aspx?Item=N82E16817207008
would work great
or even
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371050

i like the antec PSU, i have the antec 902 for my case. here is the rest of my build for anything that needs changing (this is my first build, so that is why i am picking bad parts).

core-i7 2600k.
antec 902 case
not to sure on the MOBO, but will get a good one with SLI support.
2x PNY VCGGTX570XPB GeForce GTX 570 Video Cards
6-8gb ddr3 RAM at @1333mhz
CoolIT Systems ECO-R ECO A.L.C CPU Cooler
windows 7 home premium 64bt
hp 2509m 25" hp monitor

i hope this is all good, and thanks for the input guys.

well antec is also great in USA.
Just remember,If you are going for sli you need 1000w power supply from good brand. Sli will eat 50% to 60% of given power supply.Also you are getting core i7,so you must go for 1000w.There are cheap but good quality of cooler master psu's if you don't have money to get from antec or coresair.
If you don't get enough power supply,your pc will restart every time you play game from day1.cuz its not getting power that system needs.
well ........
6-8gb ddr3 RAM at @1333mhz
this ram is must if you are seriously gonna do cad.Are you sure if you want to do cad,if not then 8 gb of ram is unnecessary as most games work on 4 gb fine.
remember
1000w psu= sli (that's it ! )

i am going to be an architectural designer, and need to get fluent in the software. and a 1000w??? every one i have talked to tells me a good 850w or 900 is safe.

It won't overload your pc. Your pc will only consume what it needs to be consumed.It won't use whole 1000w, so don't worry.Besides it is better to have future proof in case you want to run 580 in sli or want to get new hard discs.Also cooling system needs some nice amount of power power.Increase your budget buddy.You will know what i am saying when you get the pc.

we will see what happens. it is still going to be a few months before i have the cash.