Have the H50 on a EVGA X58 MB and a HAF922 case. I was able to relatively easily put the backplace on even after I put the MB in the case. I then just lightly put the cage (that holds the pump/block in place) on. Then having someone hold the backplate it place, I put the pump/block in the cage (without touching the cpu), twisted it slightly, and pushed it into place. Holding it, I tightened the screws down, first finger tight on all 4, and then screwdriver tight. Worked pretty well for me.