So I had mega problems
I bought the same cooling system.
So if you put the radiator on the top, the Ram won't fit in because the Ram is too "big".
If you put the radiator at the front, the Ram will fit in, but depending on the GraKa, it won't fit in your case. (mine: Geforce Gtx 1080 ti was too big, for example). I had to send my Ram back and am now looking for ones that are smaller. ( max. 31mm).
Have fun :3 I'm still looking for a suitable RGB Ram.