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HD7870 CROSSFIRED PSU REQUIREMENTS!

Last response: in Systems
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Power supply Authority

You need a new PSU.
That thing can only handle 468W through the 12v and its not even 80+ Certified. From what I am seeing its a fairly low quality budget supply.

750W is recommended for dual Crossfire/SLI, get a unit from a good brand like Seasonic, XFX or Corsair.
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