I'm building a PC With a GTX 780 (May or may not be Factory OC) a Gigabyte Z87X-UD5H Segate Barracuda 2TB A Corsair SSD 128GB Corsair Vengance RAM an Intel I7 4770K, only thing I ask about is the PSU I'm planning on getting a 750w PSU is that good enough? And I'm choosing between a TX750M (I know it's Semi Modular I did my research) or a CX750 what's the difference which one is better? And why? And is 750w enough? Thank you for reading.