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how much power will i need for 4 HD 5870s? - Page 2

post #11 of 34
Thread Starter 
lol... kk... and ty for the help guys... one last quick question... do 5830s eat more or less power? i would assume less, but i have heard they are massive power hogs
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post #12 of 34
They have a large difference in (Power/performance) ratio, where the 5830 uses more power than the 5850 but hasn't got as much grunt as the 5850
Edited by Mr OCN - 6/8/11 at 6:00pm
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post #13 of 34
Thread Starter 
Quote:
Originally Posted by Mr OCN View Post
They use more power/performance than the 5850
kk... that makes more sense... ty for all the help guys
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post #14 of 34
From guru:
Quote:
Power consumption

The Radeon HD 5870 for what it is producing in terms of performance, is a card with a great power specification. Placing two cards in CrossfireX definitely doesn't require you to have a kilowatt PSU.

One of the better accomplishments of the series 5800 graphics cards is the enhancement in its power design, the implementation of voltage and clock regulation is very dynamic. So if we look purely at the Radeon HD 5870 now the maximum wattage consumed would be as follows:

GPURadeon HD 5850Radeon HD 5870
TDP 1 GPU........170W................188W
TDP 2 GPUs.......340W................376W
TDP 3 GPUs........510W................564W

Radeon HD 5870
The card requires you to have a 500 Watt power supply unit at minimum if you use it in a high-end system. That power supply needs to have (in total accumulated) at least 40 Amps available on the +12 volt rails.

Radeon HD 5870 CrossfireX (2-way)
A second card requires you to add another 188 Watts. You need a 700+ Watt power supply unit if you use it in a high-end system. That power supply needs to have (in total accumulated) at least 55~60 Amps available on the +12 volt rails.

Radeon HD 5870 CrossfireX (3-way)
Here's where things get a little tricky, reserve 600 Watts for the GPUs on the +12 volt rails, another 250 Watts for the processor (we assume you are overclocking) and then add another 100W for the regulars.
A link from OCN about 4 x HD5870

In short, make sure you have at lesat 1000w, LOTS of 12v AMPS, and 4 may not scale as well as you think.
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post #15 of 34
He's not using them for CF or gaming so the scaling problem isn't really a problem imo
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post #16 of 34
Thread Starter 
Quote:
Originally Posted by grishkathefool View Post
From guru:


A link from OCN about 4 x HD5870

In short, make sure you have at lesat 1000w, LOTS of 12v AMPS, and 4 may not scale as well as you think.
lol... dont worry... im not going for scaling ... and ty for the info... so i will need around 850 - 1k W and like 70 - 80A since i will be using these in a low end system... correct?
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Big Bang Theory
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old meets new
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post #17 of 34
I know that a* 63 amp 12v rail will not grace 4x overclocked 5870s.
Edited by Weedvender - 6/9/11 at 12:33pm
post #18 of 34
For 4x 1gb versions 1000w
For 4x 2gb versions 1200w
post #19 of 34
Seasonic 400W Fanless
    
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post #20 of 34
Quote:
Originally Posted by xHighAlert View Post
Seasonic 400W Fanless
lol
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