12Gb of ram is an odd number for ram. Usually matched pairs are preferred as odd units rarely work. And if they do work timings are usually very poor.
A 630watt power supply is also questionable. Antec makes a decent one but most are lower end/ avoid if possible units. might be good since you did not state model.
Everything else is compatible, but if you can budget it, go for a better video card, it will be your slowest part.