[citation][nom]xtreme5[/nom]which one would be better for HARD-CORE gaming?HD 7990 vs GTX 690.I like 690 actually i'm not a fan of nvidia if you people thought that i'm.[/citation]
That would depend on what you consider hard-core. I would think that either a 2560x1440, 2560x1600, or a triple 1080p/1920x1200 setup would be what I'd call hard-core for these cards. For those resolutions, the 7990/7970X2s might be able to win out in most games.
[citation][nom]cbfelterbush[/nom]Both versions of the 7970x2 use 3*8pin power connections. Not 2 8pin. -CB[/citation]
The 7990 seems to use four 6 pins, implying that unlike the 7970X2s, these have much better binned Tahiti GPUs, memory, other components, and that the PCB is also more power-consumption optimized, among other differences. The 7970X2s also seem to have higher clock frequencies, but not so much that their power consumption should be almost 50% higher. They probably use regular Radoen 7970 or maybe even Radeon 7970 GHz Edition GPUs rather than presumably even better binned Radeon 7990 Tahiti GPUs.