Virtual-Hideout posted a review on the ASUS 9800 GTX 512MB Graphics Card

The bottom line here is that the ASUS EN9800GTX is a much cooler graphics card that's capable of replacing the 8800 GTX in ASUS' line up. Should you run out and replace that 8800 GTX you already have? Not really. Performance between these two GTXs is a pretty even battle with the newer 9800 winning out a little. Those looking for the newest performance card that offers the best bang for buck are going to find the ASUS EN9800GTX to be a good option. The only thing that would make it an even better choice would be a lower price tag and a decently bundled video game. It's ASUS, so anything is possible.

ASUS 9800 GTX 512MB Graphics Card Review