I am fitting a H100 to an Asus Gryphon Z87 I placed the back plate on the motherboard and screwed in the stands off's. The stand off's did not fully pull the back plate to the motherboard, there is about 1mm gap between.
Have looked on this forum and others to see is this is ok or not. Some say it is fine once the CPU block is mounted, some have even placed washers behind the stand off's.
Bit confused, and it has stopped the build for today.