Hi All,here is some results from TweakTown testing. I do 1440p

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Results

1080p: Far Cry 4 actually doesn't perform too badly at all at 1080p, but with AA enabled you're going to need 3GB+. When it comes to The Witcher 3, AO doesn't do too much at all to VRAM consumption. Battlefield 4 consumes another 20% VRAM or so at 1080p with AA enabled while Metro: Last Light uses another 30% or so - up to 1.3GB of VRAM.

Shadow of Mordor really loves its VRAM, with 4.7GB of VRAM being used at just 1080p with AA enabled, up from the 3.3GB used without AA. GTA V doesn't use much more VRAM with AA enabled at 1080p, while Tomb Raider uses another 180MB of VRAM for a total of 1.5GB at 1080p.

1440p: 2560x1440 is where the VRAM begins to get stressed out, starting with Heaven using 1.6GB compared to 819MB - a 100% increase in VRAM consumption. But Far Cry 4 is where the fun starts, with 3.7GB used, up from 2.8GB without AA. The Witcher 3 again doesn't consume much more at all, you don't notice any difference between 2168MB and 2197MB being used.

Battlefield 4 jumps up from 1.9GB to nearly 2.3GB at 1440p with AA applied, while Metro: Last Light uses another 200MB+ of VRAM at 1440p with AA enabled. Shadow of Mordor uses just under 5GB of VRAM at 1440p with AO enabled. Grand Theft Auto V uses much more VRAM at 1440p with AA enabled, jumping up from 3.9GB to nearly 4.6GB of VRAM.

4K: This is why you're here once again, to see 4K results with AA enabled. Starting with Heaven, which leaps from 1.3GB to a huge 3GB of VRAM consumption with AA enabled. Far Cry 4 uses a huge 5.7GB at 4K with AA enabled, a large jump from the 3.7GB without AA enabled.

Ambient Occlusion enabled in The Witcher 3 sees the game using another 200MB of VRAM, while Battlefield 4 uses nearly 3GB of VRAM with AA enabled versus 2.3GB without AA. Metro: Last Light consumes just over 2GB of VRAM with AA enabled, versus the 1.6GB used without AA.

Shadow of Mordor really enjoys the VRAM at 4K with AO enabled, jumping from 3.9GB to 5.4GB while GTA V absolutely leaps up from its 4.3GB to a huge 6.4GB of VRAM consumption with AA enabled at 4K.

8K: Bonus round! I ran Shadow of Mordor at 4K with 200% super sampling, which renders the game at 7680x4320, or 8K. At 8K, Shadow of Mordor consumes a mammoth, VRAM-busting 8.4GB of VRAM.

Battlefield 4 on the other hand, I could run with AA enabled, and disabled. At 7680x4320 without AA, Battlefield 4 was using 5.2GB of VRAM, while 4xAA enabled saw this skyrocket to a huge 7.5GB of VRAM.



Read more at http://www.tweaktown.com/tweakipedia/90/much-vram-need-1080p-1440p-4k-aa-enabled/index.html