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8800 ultra SLI = ?? - Page 2

post #11 of 51
i ran 3X of them on a 650W...
    
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post #12 of 51
how does that prove your point?
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post #13 of 51
a 650 watt unit wouldn't have enough amperage to drive 3 cards. My 650w unit has 54amps on the main rail and that's enough for two 5870's at most with my Phenom overclocked and even that's pushing it.
    
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post #14 of 51
He said he ran them, he didn't say he did a power supply review with them
It probably could have exploded haha but oh well.
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post #15 of 51
No, two GeForce 8800 Ultras are not gonna be pushing hard a PSU that can deliver 52 amps in the 12V rail. Seriously, enthusiasts seem to love to buy PSUs that are overkill, even if we take upgrades down the road into account.

I'm not even sure why people are calling the 8800 Ultra a power hog. It might use more power than its performance dictates, but it's power consumption is actually lower than a GTX 260 and just a hair higher than the GTX 460, and those are cards we normally wouldn't call "power hogs".

In SLI they should consume around 500W peak at the wall. Taking into account that the 650HX is around 85% efficient, they should use around 425W at full load.

OP, don't worry about it.

http://www.tomshardware.com/reviews/...er,2122-6.html
Edited by LOL_Wut_Axel - 2/19/11 at 10:51pm
    
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post #16 of 51
Quote:
Originally Posted by Kratthew D. Kraids View Post
a 650 watt unit wouldn't have enough amperage to drive 3 cards. My 650w unit has 54amps on the main rail and that's enough for two 5870's at most with my Phenom overclocked and even that's pushing it.
Yeah, but the 8800 Ultra consumes a lot less power than a Radeon HD 5870. Take that into account.

http://www.tomshardware.com/reviews/...er,2122-6.html
    
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post #17 of 51
lol true, but with two 8800 ultra's I would get a quality 650w unit and call it a day. Antec's PSU calculator says that two ultra's will pull around 330 total, and they require 22 or 24 amps. So you'll be fine, if you want some piece of mind you could get a 750w for a little more headroom.
    
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post #18 of 51
Quote:
Originally Posted by LOL_Wut_Axel View Post
Yeah, but the 8800 Ultra consumes a lot less power than a Radeon HD 5870. Take that into account.

http://www.tomshardware.com/reviews/...er,2122-6.html
not by much, only around 40w more. See for yourself with Antec's PSU calculator.
    
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post #19 of 51
Corsair 620W is all you need.

http://www.legitreviews.com/article/462/1/
post #20 of 51
2X8800 Ultras = a lot of heat. So I wouldn't use them in the summer. We called them space heaters. The 285 GTX was real hot too.
650w maybe with a top name PSU. (Seasonic, Corsair, PC Power and Cooling) Also you need 4X6 pin PCIe cables and I don't think 650s come with 4. You'd be better with at least a 750. I had a Antec 500w go on me using 1 8800 Ultra. And took my MB and RAM with it.
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