The computer will be used for playing games like Metro: Last Light, COD Ghost and Battlefield 4. Also, it has a 550W PSU, which im assuming that will also need an upgrade (750W?) I'm mainly wondering if the CPU will support the GPU's. Thanks in advance
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Why wouldn't it? In most situations it won't bottleneck your dual GPU configurations. Just make sure your motherboard supports CF and has 2 PCIe 2.0 x16 slots. I think the game that will benefit the most from your dual GPU set up is Metro, the two other games should be able to run on your system with 60 FPS with Vsync enabled with a single HD 7870.