New build, need help checking compatibility

My father wants me to build a computer for him, and this is something I whipped up pretty fast. The only request he wanted was a fast cpu since he will be using a lot of programming software and will have multiple programs opened up and running at the same time and the max price to be $500. Can someone help me check if all the parts are compatible please? I'm not sure and don't want to buy the wrong items.
A couple of things I want to add. I picked a cheap case cause he doesn't care about looks. He did want 4gb of RAM though and I picked a cheap mobo since he will be doing absolutely no OC'ing. I threw in the 8800gt for me when I go back home every so often  

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