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Which powersupply to get to power 2 X 4870X2 - Page 2

post #11 of 31
The 900W Antec HCG seems to be a really good price, cheaper than the Corsair ones. Get that!
    
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post #12 of 31
Thread Starter 
Quote:
Originally Posted by Razi3l View Post
The 900W Antec HCG seems to be a really good price, cheaper than the Corsair ones. Get that!
I know it said 1k min, you reckon http://www.ebuyer.com/product/246658 this will do the job?
Edited by elko - 5/7/11 at 1:23am
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post #13 of 31
Wow, AMD is silly.

Guru3D was able to pull 740W from the wall with their test system with two 4870x2s in it (source). If I assume 85% efficiency, then that means the system pulled 629W from the PSU.

So if I add 150W just for the CPU and other goodies (for the sake of good measure and worst case scenario), then that comes to a total of 779W of a maximum power draw from the power supply.

So wow... a quality 750-850W power supply is totally enough.

Silly AMD.
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post #14 of 31
Don't see a point in quad crossfire, because it scales so badly

Might look at 4870x2+4870 trifire, a good 750w psu would be enough for that system(maybe even a 650w).
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post #15 of 31
I just thought of a possible reason why AMD is recommending a 1000W PSU for a system with two 4870x2s in it: maybe they are trying to guarantee that their customers will not be short on PCI-E connectors.
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post #16 of 31
Overstating recommendations is the norm...750w could run it, assuming your not OC'ing till fire spurts out. 850w for piece of mind. Will you be overclocking them?
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post #17 of 31
Thread Starter 
I doubt it, 2 should be enough reason i plan on having 2 is than spending 500£ for 6990.

So a good 750 would be ideal?

id like to spend somewhere around 90 if possible but 100£ will do.
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post #18 of 31
Quote:
Originally Posted by elko View Post
I doubt it, 2 should be enough reason i plan on having 2 is than spending 500£ for 6990.

So a good 750 would be ideal?

id like to spend somewhere around 90 if possible but 100£ will do.
In that case, how do you feel about the TX850 V2?

http://www.ebuyer.com/product/257234

It's £96.42 inc. vat.
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post #19 of 31
Thread Starter 
Has to be, ! thank you very much.

next day delivery 105£ ill at leased have a psu that i dont have to worry about!
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post #20 of 31
Quote:
Originally Posted by TwoCables View Post
Wow, AMD is silly.

Guru3D was able to pull 740W from the wall with their test system with two 4870x2s in it (source). If I assume 85% efficiency, then that means the system pulled 629W from the PSU.

So if I add 150W just for the CPU and other goodies (for the sake of good measure and worst case scenario), then that comes to a total of 779W of a maximum power draw from the power supply.

So wow... a quality 750-850W power supply is totally enough.

Silly AMD.
I don't know why you're surprised?

I never believe anything of what AMD states about requirements of their GPU's, neither Nvidia.

For example, on my Sapphire HD6970's, each of them says minimum of 600W, while with x2 HD6970's, and i7 2600k @ 4.8Ghz, using prime 95 + furmark on both cards, I could never get to see above 500W.
    
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