That CPU with a 790FX chipset is a really good choice. they have been known to OC very well. The only thing I would do is get something besides DFI. I know they have an amazing reputation and are a solid mobo, but I am currently having issues with their RMA department. (for the 2nd time with the same model) So, this is more due to my current issues than it really being a poor choice.
Everything will work with everything, that power supply is plenty for your components (and leaves plenty of headroom for upgrades, as does that mobo) If you are on a budget, i would get an open box 790fx or 790gx mobo, as they are way cheaper and use the extra cash for a better video card, probably an ATI one if you are planning on going dual, as there arent and 790 mobos with sli.
Why not save yourself 90 bucks and get yourself this excellent 790gx mobo:
its just that they bios' may not have been updated yet on those as far as I know, however i have the mobo i reccomended and it works perfectly with nvidia cards, and the phenom II 920. But if you have your heart set on 790FX, these are all also significantly cheaper and equally compatible to your components:
Newegg has some amazing combo deals going on with all the new AMD CPUs and motherboards. I can personally recommend the Foxconn A79A-S. It comes with another $34 off with MIR! And yes, Foxconn is very good about MIRs.
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