Not enough power to my 7970's?

EchoOne

Honorable
Jun 24, 2012
397
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10,810
I had recently got 2 7970's to run in my system My specs are
I7 3820 OC to 4.6 ghz,
16Gb ddr3 1600mhz
1 tb HDD
120gb OCZ vertex 3
2 7970's
Along with everything being water cooled with my XSPC Pump im running a 750w Antec High current gamer.
I seem to get low usage or just bad FPS in even Battlefield 4 and Metro Last light. Not sure if my cards are not getting enough power or games are just not optimized for crossfire. Im not to sure whats going on but I was just curious as to if my psu is just not supplying enough power to my cards. Thanks!