So, I had a bunch of 7990s left over from the litecoin mining days, and these cards came with a 3 year warranty.
With under 1 month of warranty left, one of the cards died - so went to get it claimed under warranty. They couldn't fix or replace the card, so they suggested giving me a 390X. I obviously refused and wanted something with equal or better power. A few days later, they called me back and gave me a brand new HIS 295x2 as a replacement. For free.
The 7990 alone was doing close to 40MH in Claymore (almost 20MH per GPU)
The 295x2? Lol... overclocked to the max, it hit almost 69MH! (~34.5MH per GPU) but the best thing about this card is the water cooling. I'm mining at the speed mentioned above with a cool 66C.
Its a shame these cards were so ridiculously expensive when they were launched, but if anyone can pick them up used, go and do it. I really want to see someone make a 4x 295x2 rig