Would 2 MSI GeForce GTX 650 Ti Boost 2GB Twin Frozr (http://www.pccasegear.com/index.php?main_page=product_info&cPath=193_1442&products_id=22993) be better than 1 Sapphire Radeon HD7970 3GB OC Edition with Boost (http://www.pccasegear.com/index.php?main_page=product_info&cPath=193_1309&products_id=21322)