You don't need that much graphics power to run at 1366x768. A radeon 7750 or lower is better. But, among those 2, I would definitely get the twin frozr II. It performs better than the asus cooler and produce almost the same noise level. It also has a better build PCB and more overclocking headroom. Bear in mind these are cards suitable for playing at 1920x1080(1080p). If you plan to buy one, better get a new monitor afterwards
MSI 560ti twin frozer is an amazing card.