I want to buy a Gigabyte GeForce GTX 970 Gaming, Windforce 3X, 4096 MB DDR5. I will nead a PSU for that so I was thinking of a CX750 750W or a CS750M 750W. The CS750M 750W is 26 usd more expensive than the CX750 750W. Is the CS750M 750W worth puting the extra mony or not ? I wold use the Boost clock: 1329 MHz or eaven overclocked the card !