GoW:UE doesn't appear to be a GameWorks title since it's not in the program. It looks like it's developer agnostic which happened to use HBAO+ and often times it works fine on AMD ...
Ctrl+F "Gears of Wars"
Nvidia GameWorks in Action:
GameWorks Games (PhysX)
https://developer.nvidia.com/gameworks-action
http://www.extremetech.com/gaming/224216-is-nvidias-physx-causing-amd-frame-rate-problems
In any event, Gears of War was a poorly optimized turd at launch that required patches; and today it runs
faster on AMD cards of similar tiers than NV. "Now the game has received game ready drivers from both AMD and Nvidia and
has received a new performance PC patch"
Other than 980Ti, NV's performance in QB is attrocious.
$299 280X ~ $1000 Titan > $650 780
$280 290 ~ $550 980
GameGPU reports:
"The game has an internal limit FPS, which is a consequence nondisconnectable vertical sync. When using the
monitor 120 Hz this interference disappears as unexplained subsidence of the FPS, which strangely increasingly manifested in the screen frequency of 60 Hz."
BTW, another game where 2GB GPUs are DOA:
"Just about the lack of a
2-gigabyte solutions in testah- due to poor optimization they are not able to provide acceptable fps even at low settings (except for low settings of the game, which are set by default in 720P, where they are able to provide a stable 30 frames)."
But ya, on AT there will be more people still defending 2GB cards, even in 2017 I bet.

I am hoping one day the same people who defended 2GB cards like 960 will come forward and admit they were wrong.
Fury X continues to underperform for its shader/TMU count. Manages to beat 290X by 31% despite 53% more SPs and TMUs theoretical perfomrance and that's when faced against a thermal throttling <1Ghz 290X rather than an after-market 290X/390X.
Just like GOW, we should revisit this title once MS fixes SLI/CF support, allows disabling of VSync and the game has gone through 2-3 performance PC patches and various AMD/NV drivers.
Either way, Mahigan's and Silverforce11's theories of modern games starting to take full advantage of GCN architecture is coming true as modern game after modern game performs much better on GCN cards than similarly priced/tier NV cards, with 980Ti (TX) being the sole exception. 970 is starting to be left in the dust by R9 390/290X.
Not sure if it's the screen capture tool or the game's graphics are very unimpressive. Lowest and Max/Ultra look almost identical, other minor increases in texture quality on signage and deeper shadows. Straight up console port.
Low IQ
High IQ
Low IQ
High IQ
For the level of graphics, at least from these screens, the game runs like a turd on high-end hardware.