The ASRock board has built-in threaded cooling standoffs that are larger than the EVGA screws. Furthermore, there is no hole through the board to allow placement of the plastic backplate that comes with the cooler after which I could thread the smaller standoffs through the built in threaded "studs."
Has anyone installed an EVGA 280 mm CLC on an ASRock x299 or any other ASRock board?
What are the tricks to get this done? Specifically, what screws did you use to fasten the cooler to the CPU?