Do I need a Higher wattage PSU for 2 R9 270x's

[svance76]

I just bought a second R9 270x from new egg, hey it was on sale and I had the money. My question is will I be able to crossfire it with the other one I already have on a corsair cx600m, or do I need to get a PSU with a higher rated wattage like a 700w or 750w. I plan on building my son a computer for Christmas so if I need a higher wattage it no big deal cause I still need to buy a second PSU for his computer. I have done some PSU calculations and a couple of them said I was fine, was just wondering what some of you may have. As always thanks for your advice.

 

AMD FX 6300

ASRock 990 fx killer MOBO

Samsung 850 pro SSD

HDD 1TB 7200 rpm

corsair cx600m

NZXT kraken X41

2 4MB AMD r9 series @ 2133 memory W/ 2 4MB corsair vengeance @ 2133

DVD ROM optical drive

MSI R9 270x (only 1 currently, waiting for the other one)

[I/O]

CX600M has +12V@46A so thats plenty. However you will still have to run molex to 6pin adapters as the CX600M has only two 6pin PCI E power connectors and you need four.

[Victor Yiu]

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[svance76]

thanks, guess that means I can buy a cheaper PSU for my son since he is not going to be running anything close to what I am running. He will just be running a AMD A10 7850k on an MSI A88x MOBO with a 1 TB HDD may add to it as his attitude and grades allow lol.

[svance76]

How can you tell if a PC game is crossfire compatible?