What is your definition of inferior?
GCN in its Tahiti to Hawaii iterations turned out to be better, or at least aged much more gracefully than Kepler in the long run, and that was a trend that one could see a while back, it's nothing new.
I'd also like to see your position on GF100/110's
truly ridiculous power consumption (and on the 480's case, only a 10% performance advantage for over 100w more vs 5870) over AMD's HD5000 series where the exact opposite happened in that regard, and you nV guys didn't give a damn about. In fact AMD held the perf/W crown for quite a while during their VLIW5/4 days and suddeny when nV starts marketing that particular metric with Kepler, it becomes the holy grail. 780Ti vs 290x is a comparatively microscopic difference in power usage and the 290x was given the image of requiring a nuclear reactor to be able to use it, when it's quite the opposite. If anything the 290x's perf/w has improved quite nicely and I'd say it has surpassed the 780Ti's considering the latest performance metrics. Impressive.
Anyway, Kepler vs GCN is a closed chapter. As always, nV's marketing was successful in brainwashing their userbase and AMD's was as inept as always, not able to put up a fight in that regard. I hope that changes for the better with the 390x's arrival.
The 390x and its up to date GCN are Maxwell's competition, Hawaii just had to put up a fight with GM204 and it did quite sucessfully, considering it's just a 10% difference between 290x and GTX 980.
With that kind of performance increase over the 290x, if priced accordingly there isn't much of a point in the Titan X... AMD will probably force nV's hand... if only they can advertise their best card in quite a while and get it to sell as it should.
You got the point my Bro

its called nV Propaganda lol
IMO all GCN's are Superb GPU's and have H/W Features way ahead Time
DX11.1 11.2 11.3 + Vulcan + DX12.3 all Thanks to Mantle

============================================
So the nV and their "New" Maxwell (Fermi rev.5 ! ) (+ 970 Lie/Fail).
The "company" i have Ignore Mode ON always ;-)
+ nV Game/FailWorks and New Games only with DX11_0 H/W !
SoM, DyingLight, pCars, Witcher3 etc. all in Dx11
Lol DX11 ? Dunno 7 years old now?
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But 11.1 + 11.2 have 1 year:
AMD Games Evolved: Performs well on AMD and nV

DX11.1 present in:
BF4, StarCitizen, Alien Isolation, NFS Rivals + maby other Dunno
DX 11.3 + DX12.3 Support (mantle in FrostBite3.1 still

:
StarWars Battle.. , DeusEX Universe, TomRaider Next + will be DX12.3 in StarCitizen 100% and other upcoming titles
So nV go home and give Pascal already...
Here the Proof of nV DX11 = DX11_0 in BF4 (780Ti & 980) (75deg. cels)
->
https://www.youtube.com/watch?v=ae5dqR5BWZU
And on My RIG BF4 Maxed 1793:1344 so >FHD in DX11.1 (1050/1550 60deg cels) :
->
Dont look into GPUz or nV Panel for the H/W support cuz is a lie !
Anybody can wrote in code to show DX11.2 H/W support ! DX11.2 is only API that can support games in 11.2 (no game is using it !)
GPUz has error cuz shows DX11.2 SM5.0 lol DX11.2 has shader model 5.2 !
Every instance of DX has better optimised SM so:
DX11 5.0
DX11.1 5.1
DX11.2 5.2 and so on
-> here proof ->
http://www.hardwaresecrets.com/article/131
No Comments. Knowlege is POWER and SCENE always Rules... Still and beyond