yes but no1 expected this card to beat out the 4890 because the 5850 is the next card up, and we coudn't have it in that performance range because it would make the 5850 obsolete.
Its not about Dx 11 or performance. Its about getting the best bang for the buck, what I want to kno is your question.
DID you buy the 4890 and you can exchange it for a 5850 (meaning get your full money back) or do you have a 4890 and you want to know if you get rid of it and upgrade to the 5830.
Its a big difference. If you have a 4890 and can't get ur money back, this post is answered with a big fat no dont upgrade.
People are forgetting the 5830s extra OC headroom, Driver updates and potential when DX 11 is implemented. Granted it isnt yet, but it brings to the table more than dx 10 and 10.1, alot more. Surprisingly, AVP implemented it pretty well if you have a good eye.
In all honesty if AMD wants to sell this card along side the 4890, its because they want to phase out the 4890 and make as much money as they can before the 400s come out from Nvidia.
If your buying a card, 5830 is great, if you already have a 4890 (non refundable) dont do it, it woul dbe a much better to grab another 4890 and Cf those.
I had them in CF Temporarily till my 5870 came (they were my friends) and I can tell you that if the drivers are good Ati runs better than Nvidia in multi card, and is more flexible.
The only problem is, ATI's drivers suck overall, and aren't like I remember them from the 9800 and 1800/1900 days. If any1 remembers "Catalyst the most reliable drivers" Even then I used Omega Drivers which aloud overclocking and fine tuning
Anyways good luck!!!
P.S
If your in no rush, wait till march 26, we will see a price shift