Yes I know that it's not a reference card and the only fullcover for the cards is the EK model I mentioned.
But I think I should be able to fit two 280mm in the HAF x cabinet one in top and one in the back.
So what 280 kit plus one extra 280rad should I get? And should I have one loop with to rads or two loops (one for CPU and one for the GPUs) I would like If I could do with one loop only.
For what its worth, a 360 rad fits very comfortably in a HAF-X even with push/pull fans. The only restriction I've encountered is that you would have to use a 25mm thick fan for the center fan of the radiator as otherwise it bumps into the RAM slots if 38mm.