I suggest ASUS to pay attention and try to get good samples AMD R9-390X.
They could design R9-390X 8GB Matrix Platinum 100MHz OC.
Some rumors say AMD offer that card under 400$. For 400$/400e that could be good option for CF.
Why not? I would first thought to immediately replace my GTX780Ti with 3GB for that card. Only little improved over R9-290X new R9-390X 8GB could offer exactly same performance as GTX780Ti only with 8GB and option to install one more. Than that will be serious setup stronget than crippled GTX980Ti with 2GB more memory and good number of NVIDIA customers will decide probably to go on that version. Many of them who are dissapointed with GTX970 mess and people who used on normal price and normal cards, not crippled and every year 100-150e more for single graphic card.
NVIDIA no excuse, Intel is much stronger than AMD, than GeForce from Radeon but Intel didn't ask double for 4790K compare to 2600K or 3770K.
All of their processors are same price or 10-15% more, no matter where you look, extreme was 1000 and now is 1000. From other side GF110 is used for premium card GTX580 and for Tesla, she cost 450e, and now successor of that card cost 1200e and even NVIDIA have so much confidence that they made Tesla from GK100/GK210 Kepler and next will be Pascal. Maxwell will not see Tesla.