With the GameWorks features disabled the GeForce GTX 980 Ti was 21% faster at 1080p and the Radeon R9 390X became 18% faster. Lower end GPUs such as the Radeon R9 280X picked up some much needed extra performance as well rendering 5fps more when comparing the minimums and 8fps more on average.
Now at 1440p the GTX 980 Ti was around 16% faster with GameWorks disabled while the Radeon R9 390X picked up 23% more performance. The R9 280X also performed a lot better with a 25% higher minimum frame rate and a 20% higher average frame rate.
Now at 4K the minimum frame rate of the GeForce GTX 980 Ti was 26% higher with GameWorks disabled allowing it so stay well above 30fps.