One of the most important things you have to look at when it comes down to the performance of this card when compared to cards like the GTX 260 and GTX 275 is that at 2560 x 1600 there isn't really much of a difference between the cards. It doesn't really matter that the HD 4890 is 20 FPS and the GTX 275 is 25 FPS; if we're below that 30 FPS minimum it's pretty much considered unplayable. The thing also worth noting is that the GTX 260 we looked at is a pre-overclocked card.
If you want to game at 2560 x 1600 you're better off looking at a GTX 285 or even GTX 295 depending on your budget. If you're gaming at resolutions up to 1920 x 1200, though, the HD 4890 is a perfectly placed card.
While the HIS HD 4890 iCooler x4 hasn't hit the market just yet, we should see it in the next few weeks. Of course, with the HD 5870 coming out the last thing HIS would want is their model to get put to the side as all the focus is moved to the new HD 5800 cards.
When it comes to price we should see it come out pretty aggressively, around the $200 US mark is a pretty safe bet. When you throw in the fact that HIS have chosen to include the ability to get a full version game along with offering native HDMI, the whole card is a fairly good looking package.
At 1920 x 1200 the HD 4890 offers some good performance. Chuck in the package that HIS are offering and the performance of the cooler in the noise department and we've got a really good card on our hands.