I just read a rewiew on a test between these two cards... the 275 was overall better for the price and performance... but they didnt take in a count for the oc on the 4890... my question is which is better after oc? the 275 has much higher load temperature so idk how much i could oc it and be safe, if i can oc the 4890 to high speeds and still maintain a safe temp then it appears it would be the better choice. after a reasonable high oc on the 4890 it would out perform the 275 without a doubt