Help with buying PSU

Hello, I am going to be building a computer soon and I have chosen all of the main computer components but now I have to pick a PSU for it all.



Here is what I am going to have:

Motherboard: eVGA nForce 680i SE SLI (TR Version)

Processor: Intel Core 2 Duo E6850 (3.0 GHz)

GFX: eVGA e-GeForce 8800 GTS Superclocked 320MB PCI-Express

Ram: 2GB OCZ DDR2 OCZ2N800SR2GK PC2-6400 SLI-Ready Dual Channel

HDD: Western Digital Caviar SE16 500GB SATA

OS: Windows XP Pro



For the Hard Drives I will eventually want to have 3 Hard Drives. One for the OS, another for Normal use/gaming, and another HDD for my audio recording projects. I will probably get a 10GB, and two 500GB.



I know the Geforce 8800 GTS needs a minimum 400 watt PSU with a +12 Volt current rating of 26 Amps.



I might want to run two Geforce 8800 together in the future and according to this post:

Power Recommendations by Video Card

I need a 650Watt power supply with 52 Amps to do that.



Now I am am pretty sure everything I have already picked above will all work together (If not please tell me) but for the PSU I am really not sure what I should get.



I am going to be buying all my stuff from Anitec.ca so if anyone could recommend a PSU from that online store that would be great.



By the way, anyone have any experience with Anitec.ca? They seem to have really good prices but are they a good place to deal with?



Is this a good PSU to get?

http://www.anitec.ca/product/9411/co..._power_supply/

I would definately like to get a cheaper one so I have more money for a LCD monitor, but I don't want to end up with a bad PSU.



Or maybe this one:

http://www.anitec.ca/product/8822/oc..._power_supply/

The Coolermaster is OK for a single 8800GTS, but won't be able to handle two. It's actually a rebadged Seventeam 500W PSU, which is rated for +12V@30A.

The OCZ StealthXStream is better, and would certainly be better than the Coolermaster, but still isn't something I'd recommend for SLI'd 8800GTSs. It's very much the bare minimum in terms of output power, and the high ripple would be a concern at those sorts of loads.

Anitec have an Antec TPIII 650W for $115.95, and a Corsair HX620 for $125.95 after rebate, which are better, albeit more expensive choices. They'd be about the smallest I'd be willing to recommend for SLI'd 8800GTSs.

Okay thanks for the info.

So just to make sure.. Is this the one you are talking about?
http://www.anitec.ca/product/6743/an..._power_supply/


I won't be running two 8800 anytime soon but I would rather get a PSU that I won't have to upgrade later down the road. Is it okay to have a big 650W PSU when I am only using one 8800?

or how is this one?
http://www.anitec.ca/product/9519/an..._power_supply/

or this one?
http://www.anitec.ca/product/6237/oc..._power_supply/

The Corsair HX is only 620watts so would that work with two 8800's because I read a sticked post here that said two 8800 need a 650watt PSU with 52 amps.

The corsair 620w puts out 50a, the OCZ 700w puts out 50a. Of those you have listed above i would get the gamexstream. But for quality i would get either the Corsair or the OCZ GameXStream model.

So will 2 amps make a difference? Because I read that for two 8800 you need a PSU with 52 amps.



I want to get a PSU that will work with SLI (two 8800) so if I decide to get another 8800 down the road, I won't have to upgrade my PSU.



Is there a down side to getting a 700 watt PSU if I don't need it right away? Will a 700 watt PSU make the hydro bill go up even if I am not needing all of that 700 watts? Or will the computer only take as much power as it needs?

It was the first one I was referring to, but either will be fine.



The GameXStream has the same problem as the StealthXStream with regards to ripple that exceeds ATX specifications at high loads. Aside from that, they're not bad units, but when the Corsair is in the same ballpark price wise, I'd be buying the Corsair - they're not really in the same league quality wise.



I know, I remember writing it . In truth, those are general recommendations. Two PSUs with identical ratings are sometimes capable of putting out vastly different amounts of power, so I have to be a little conservative when stating general recommendations. The Corsair is conservatively rated for 620W continuous @ 50C, which is a lot more than I can say for some PSUs. It will work for a system like yours, Corsair have proven that.



No there's no downside - a PSU will only draw as much power as it needs

Okay, you talked me into it..

I will get the Corsair HX 620W Power Supply

Thanks for the help

I just noticed something about the Corsair 620HX PSU. The fan is located on the bottom of the PSU and I am getting a Antec 900 case that has the PSU mounted on the bottom of the case.



So would I have to install the PSU upside down? And if so, is is alright to have a PSU upside down?

I got the Corsair 520W and that is working great.

Same concern was here when I bought the Antec P180, I slapped myself on the forehead when I noticed there was space for the fan to blow under that raised platform.