Too little to late for me. Went from a GeForce 6800go to an hd4890 to cfx 4890s to a single 6970 to cfx 6970s and finally picked up a 690 since it seemed no dual gpu was coming from the red team. Sold my old 775 rig and my 6970s to get funds for the flagship card. I used my igpu for a few weeks while I gathered the funds and ended up only paying 245 out of pocket to get the 690. For me the 690 is a better fit due to power consumption and only dual slot. It's a hell of a card.
Between this card and the 690 it seems completely based on the games tested. I don't see a clear cut winner of performance. I do see the pros of the 690 compared to this 7990 as has already been listed. If you have the money get one or the other based on what games you play. My 2 cents.