AMDRadeonHD :
Bare in mind that Titanfall is VRAM heavy, Battlefield 4 uses almost 2GB's of VRAM at 1080p full ultra, so the 4GB R9 290 would eat those games without a hiccup.
It;s been widely documented that "using 2 GB of memory", is very different from showing a performance improvement with 2 GB of memory....especially at 2560 res or less
http://alienbabeltech.com/main/gtx-770-4gb-vs-2gb-tested/3/
There isn’t a lot of difference between the [2GB and 4 GB] cards at 1920×1080 or at 2560×1600. We only start to see minimal differences at 5760×1080, and even so, there is rarely a frame or two difference. If we start to add even more AA, in most cases, the frame rates will drop to unplayable on both cards.
These games were determined to have the moist significant differences at 5760 x 1080 largest difference on any game playable at that resolution was 1.9 fps .... but theFPS at 1920 x 1080 was:
Metro goes from 31.0 to 31.8 w/ 4 GB
Lost Planet drops from 85.8 to 85.2 w/ 3 GB
Dirt Showdown goes from 70.4 to 70.5 w/ 4 GB
Sleeping dogs goes from 53.4 to 53.5 w/ 4 GB
Hitman Absolution goes from 49.6 to 49.8
Grid 3 goes from 80.3 to 83.4
Lasty Light went from 44.5 to 45.8
That's an average of 0.14 frames per game
This leaves five games out of 30 where a 4GB GTX 770 gives more than a 1 frame per second difference over the 2GB-equipped GTX 770 [at 5760 x 1080]. And one of them, Metro: Last Light still isn’t even quite a single frame difference.
Of those five games, two of them are unplayable at 5760×1080 although in these cases, 4GB GTX 770 SLI would finally make some sense over 2GB GTX 770 SLI. That only leaves Lost Planet 2 and two racing games that gain some advantage by choosing a single GTX 770 4GB card over the single GTX 770 2GB.
There is one last thing to note with Max Payne 3: It would not normally allow one to set 4xAA at 5760×1080 with any 2GB card as it claims to require 2750MB. However, when we replaced the 4GB GTX 770 with the 2GB version, the game allowed the setting. And there were no slowdowns, stuttering, nor any performance differences that we could find between the two GTX 770s
That last paragraph is the most telling. Max Payne 3 will use 2.75 GB of VRAM if it's there..... but using only the 2GB card, there was no impact at all on performance .... "
there were no slowdowns, stuttering, nor any performance differences that we could find between the two [ 2Gb and 4 GB] GTX 770s."