decent PSU for 7970 vapor-x crossfire+ i7 3770k please have a look

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xXSnAkEXx

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Jun 24, 2013
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hello i will buy a new pc soon, and am going to get crossfire 7970 vapor-x and overclock them i wont go hard core on clocking tho and will probably overclock the i7 to 4.7-4.8,also going to put some fans on my case u know like all do and probably noctua 14d for cooling i just need some expert openion, i dont want to regret something later how many watts do i really need, will a xfx 850 watt bottleneck or should i pay 70$ more for the 1050 watt, thanks in advance
 
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johnvonmacz


7970's in crossfire requires a minimum of 750W so 850W is the sweet spot. But if you can afford 1050W then why not? :) At least you can futureproof the PSU if ever in the next few years when more GPU's will need more power, you don't have to buy another PSU.
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johnvonmacz

johnvonmacz

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Apr 27, 2012
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850W is enough for that setup. Just make sure to get an 80 plus Silver or Gold version. :)
 
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kewlguy239

kewlguy239

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Sep 9, 2012
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usually, psu requirements for crossfire is easy to determine. take the power requirement for 1 card and double it. If 1 card requires 38amps on the 12volt rail, then get a PSU that has at least 72amps on the 12v rail for crossfire. I believe your 850 watt supply will handle this.
 
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johnvonmacz

johnvonmacz

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Apr 27, 2012
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7970's in crossfire requires a minimum of 750W so 850W is the sweet spot. But if you can afford 1050W then why not? :) At least you can futureproof the PSU if ever in the next few years when more GPU's will need more power, you don't have to buy another PSU.
 
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