ATI 4890 vs. nVidia GTX 275?

First off, I would recommend looking through http://www.tomshardware.com/reviews/best-graphics-card,...

While that list isn't the end all decision maker for video cards, you might notice neither of these are on there. I honestly think the GTX 260 Core 216 would handle Aion just find. I didn't find any system requirements for the game, but the 260 can handle pretty much anything that's out right now pretty well. It also saves you some money.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Either card would absolutely destroy aion. Aion is really optimized, and runs surprisingly fast, even on bad hardware. Even a nvidia 9800 destroys aion, and I bet a 8800 would run it very well.

It's up to you, really.

i currently have a 4980 OC to 900/1000 and i've been in all the Aion beta. For the most part of the game, 90% of the time it runs it perfectly fine. I have all the settings on max at 1650x1080 but inside cities with a lot of ppl or during raids/rifting with massive people, you can see it slow down but nothing that would affect gameplay too drastically. But the FPS does drop.

A 9800/8800gt will run the game, but i'm sure the FPS would drop a lot more in those intensive moments on max settings than a card like a 4890 or gtx275.

My housemate runs a 4870, and it also runs the game just fine. I would advise you to get a 4870 instead and save a bit of money over the 4890.