1440p and 4k both registered 60fps max and 59 average with both running at the same graphical settings when I did the benchmarks, hence getting the same score. 1440p shoud have had a much higher frame rate. Might be to do with Rivatuna running in the background which overruled the Assetto Corsa benchmark?
Something else is happening with your results. I am running with a evga GTX970 SSC and a single 4K/60hz monitor. I have been running at it's max resolution at 3840 X 2160. I ran a benchmark on it.
3840 X 2160
AC VERSION: 1.3.4 (x64)
POINTS: 7998
FPS: AVG=54 MIN=43 MAX=99 VARIANCE=0 CPU=27%
LOADING TIME: 16s
GPU: NVIDIA GeForce GTX 970 (3840x2160)
OS-Version: 6.2.9200 () 0x100-0x1
CPU CORES: 8
FULLSCREEN: ON
AA:4X AF:4X SHDW:2048 BLUR:0
WORLD DETAIL: 4 SMOKE:3
PP: QLT:5 HDR:1 FXAA:0 GLR:5 DOF:5 RAYS:1 HEAT:1
When I saw this result I was struck by the fact that the GPU was not able to keep the monitor fed at it's full capacity while the computer was loafing. So I tried 1080p for the output.
1920 X 1080
AC VERSION: 1.3.4 (x64)
POINTS: 22911
FPS: AVG=156 MIN=72 MAX=241 VARIANCE=25 CPU=78%
LOADING TIME: 12s
GPU: NVIDIA GeForce GTX 970 (1920x1080)
OS-Version: 6.2.9200 () 0x100-0x1
CPU CORES: 8
FULLSCREEN: ON
AA:4X AF:4X SHDW:2048 BLUR:0
WORLD DETAIL: 4 SMOKE:3
PP: QLT:5 HDR:1 FXAA:0 GLR:5 DOF:5 RAYS:1 HEAT:1
The GPU is now really pumping out the frames, the CPU is working a lot harder BUT the quality of the picture on the monitor is significantly less detailed. It is easy to the see the quality difference. So I selected an intermediate resolution between 1080p and 2160p with the same aspect ratio.
2560 X 1440
AC VERSION: 1.3.4 (x64)
POINTS: 15517
FPS: AVG=105 MIN=77 MAX=148 VARIANCE=0 CPU=53%
LOADING TIME: 11s
GPU: NVIDIA GeForce GTX 970 (2560x1440)
OS-Version: 6.2.9200 () 0x100-0x1
CPU CORES: 8
FULLSCREEN: ON
AA:4X AF:4X SHDW:2048 BLUR:0
WORLD DETAIL: 4 SMOKE:3
PP: QLT:5 HDR:1 FXAA:0 GLR:5 DOF:5 RAYS:1 HEAT:1
I am going to be using this setting for a while as this seems to be in the sweet spot for my rig but has me thinking about a new GPU that can comfortable perform with minimums above 60fps at a full 4K resolution. Is anyone currently running a GPU on a single 4K monitor that meets this objective.