I'm currently running a system which contains a GIGABYTE GA-990FXA-UD3 a single sapphire 7950 and a FX-8150 with no OC my question is will my Antec EarthWatts EA-650 GREEN 650W support a second 7950 in crossfire? thats pretty much it XD
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More aboutgood enough
Yes it will size wise but lacking 2 x PCIe power connectors. I would suggest an upgrade to 750watts.
No simply because it doesn't have enough PCI-E Connectors, your Power Supply only has 2 x 6+2 Pin PCI-E, a 7950 crossfire needs 4. Besides a crossfire of those GPU's needs like 750 watts.