The EK GPU Only blocks would be a good choice as Long as you use an
ACX Graphics Card that have a VRM/Menmory Heat Plate that can be retained for air Cooling while the GPU is using water cooling.
When I used my "GPU Only" water block on the Nvidia Titan XP's, Since they did NOT have a separate Heat Plate, I had to install a "Shim" between the water block and the GPU to allow the water block to make good contact with the Chip due to the
Blower Style Cooling that drops the top of the Chip about 1/8" below that type of Heat Sink.
THIS is why you noticed my Titan XP GPU Temps under Load was 59C-65C opposed to if the block was directly on the Chip which resulted in a GPU Temp of 41C-44C under Load.
The "Shim" I installed caused a cooling loss because it retained Heat under Full Loads.
After looking at the EK block on their Web Store, They show it is compatible with all the new Pascal Cards, But they also show NO Memory or VRM cooling plates/heat sinks and leave these components bare for "Open Air" cooling.