According to AMD 500w or greater for the 7770. 450w would probably be enough granted you don't overclock anything. I know my old 6850 said it required 500w but the system used around 400w. Use a psu calculator and see what you need by filling out the list of parts.
Leaning towards the XFX one and if I do get it, I shouldn't have trouble with putting it onto my mobo and making it fit into my case? _________________
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