GeForce GTX 275 and Radeon HD 4890 Round-Up

we evaluate the features, performance, and overclockability of 7 GeForce GTX 275 and Radeon HD 4890 graphics cards in one large round-up. We take a look at cards from Asus, MSI, Gigabyte, XFX, Diamond, HIS, and EVGA--three Radeon HD 4890s and four GeForce GTX 275s. We evaluate single card and multi-GPU performance, power consumption, and temperatures. So which one of the cards deserves your hard-earned dough?