How big of a power supply do I need for crossfire

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wxyzsupermod

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Mar 8, 2013
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How big of a psu do I need for crossfire r9 270's they have one six pin each so I thought my 500 watt might be enough it's a corsair but I'm not positive
 
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It's not only about the PCI-E power connectors, it's also about whether the PSU has enough wattage on it's 12V rail. You would want a PSU with a 12V of at least 30A. Usually a 650W PSU can handle it.
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JackNaylorPE

JackNaylorPE

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Option 1 - Check reviews like Guru3D
http://www.guru3d.com/articles_pages/amd_radeon_r9_270_review,8.html

This is Guru3D's generic power supply recommendation for the R7 and R9 series:

AMD R9 270 - On your average system the card requires you to have a 500 Watt power supply unit.
AMD R9 270 Crossfire - On your average system the cards require you to have a 700 Watt power supply unit as minimum.

AMD R9 270X - On your average system the card requires you to have a 500 Watt power supply unit.
AMD R9 270X Crossfire - On your average system the cards require you to have a 700 Watt power supply unit as minimum.
If you are going to overclock GPU or processor, then we do recommend you purchase something with some more stamina.
Click to expand...

Option 2 - Use a reputable PSU calculator

http://extreme.outervision.com/psucalculatorlite.jsp

So 700 watts if ya not overclocking
 
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JackNaylorPE

JackNaylorPE

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Who knows ? It says it's 800 watts, but no name brands when tested often fail to deliver rated voltage. The EVGA B2 750 would be more than enough ... it's currently $50 over here after a nice rebate. This one is quite decent and given the fact that it is twice the price of the one you linked to, I like the one you linked to even less.

http://www.centrecom.com.au/antec-750w-high-current-gaming-power-supply
 
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