http://www.tomshardware.com/reviews/radeon-r9-290-review-benchmark,3659.html
Tomshardware bought 2 retail 290X's and both of them perform considerably worse than the golden samples that they were clearly sent by AMD. This raises some serious concerns. All of the reviews I saw of the original card put it ahead of the 780, yet if the retail cards are actually performing just a smidge over a 770 we are getting ripped off. It does appear AMD has been dishonest on purpose and I hope other reviewers take note of this and get retail cards to test. This could be a gigantic scandal.
With so much riding on the amount of throttling the card does its a big concern. The after market cooler they use however seems to be awesome, should solve the problem and make an excellent performing card to boot. But you need to factor that into the price of the card or watercool the darn thing.
Frame variance is still a bit of a concern looking at the pcper.com results for crossfire. Its not a sea of orange in the background but its still at levels where people can tell its there.
These cards are turning out to be a trade off, noise to performance and at crossfire variance to outright frame rate. Its not a clear cut win really, the rough comes with the awesome.