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I don't know what the Nvidia equivalents are but if a game supports AMSAA you can get better quality than FXAA by using AMSAA-Edge detect/EQAA/Temporal AA. Probably higher framerates and definately better quality.
Even if a game dosen't support FXAA simply using 2xSSAA-edge detect+EQAA+mabye...
7970 isn't overkill for 1600x900
Turn on EQAA/8xSSAA+Edge Detect/x3 Temporal AA/-10 LOD/16xTrilinear AF/Alpha sharpening/AFO/TFO/Flip que 1.
DO NOT USE FXAA OR MORPHOLOGICAL. IT KILLS FPS AND BLURS EVERYTHING. THERE IS NO REASON TO USE IT FOR ANYTHING UNLESS YOU SIMPLY LIKE THE BLURRING...
7970 is stil better imo than GTX 680.
7970 gains more from OC than 680 and probably higher % of good bins vs bad bins.
7970 has better electrical design IMO.
7970 has excellent performance across all games, 680 chokes hard on a few.
7970 capable of higher quality GFX than 680 due to Alpha...
7970 will push BF3 @ 1080p 120hz with adaptive AA on, Edge detect. Use Temporal AA/non trilinear AF. Might have to tweak some details from ultra but not many.
Adaptive AA for AMD cards was added last patch I think and it works very well.
Of course the 680 feels smoother.....it's better than thoes cards. And the 6990 suffers from a small amount of microstutter.
I'd put the 7970 overclocked with
-10 LOD/Alpha tweaks/4 minimum & 4 maximum theads/ x3 Temporal AA/Flip que 1/Forced 75 hz//Enable Surface format...
Get the 7970 and rig another fan inside the case to force more air through the card. With Voltage mods you should be able to hit 1200.
Add the tweaking from Ati Tray Tools and it is better than 680GTX
You start adding SSAA/Negative LOD/Trilinear AF and the 7970 pulls ahead.
ATI Tray...
Linux will move foward.
Code from Android is starting to make it's way into the Linux Kernel and as more of that happens Android Apps/Games will be useable on Linux. It's only a mater of time till Android/Linux gaming takes hold.
Developers might also Take notice and make better graphics...
CMT benefits more heavily threaded applications since it places the 2 threads that share the most cache in a module so they can both use common cache hits. It effectivly increases L2/L3 cache by whatever the 2 threads have in common as far as cache goes.
WoW got a 10% improvment from W8 CMT. And it isn't a heavily threaded game.
The improvments from RCM should enable close to 6ghz clocks on Air cooling.
AMD Piledriver will be a LOT better than bulldozer. If you add all the improvements up that are comming down the pike it's something silly like 40% better.
10-15% better IPC
10%-15% from Windows 8 CMT
20% from Resonant Clock Mesh.(10% from power reduction enabling higher clocks)
(And...