How big of a bottleneck is this combination?

AMDRadeonHD

Honorable
Jan 10, 2013
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ASRock 970 Extreme4
AMD FX-6300 3.5GHz
Patriot Viper 3 2×4GB DDR3 1600MHz
MSi Radeon R9 270 2GB GDDR5 Gaming
MSi Radeon R9 270 2GB GDDR5 Gaming
Zalman Z3 Plus
Western Digital Caviar Blue 1TB
Seasonic S12II 620W
Since Battlefield 4 supports Mantle (Which eliminates CPU and GPU bottleneck) it won't be that big of a deal, will it?
 

jb6684

Distinguished
That's a good powersupply, one of my favorite brands Seasonic (Corsair, or Antec), BUT, it's a bit too small for Crossfire 270's.... (and would likely fail with 270X's or 280's....)

http://www.anandtech.com/show/7503/the-amd-radeon-r9-270x-270-review-feat-asus-his/16

They draw 150watts each so 300watts plus about 200watts for the system too close for a long term stable operation. Get a 750watt supply from same vendor for this build.