I'm currently using a Corsair H80i GT. I bought this two years ago because I had a mATX case. Now I'm back on ATX and wondering if it makes sense to switch. I'm using an 8700K with a head @4.8GHz (with AVX offset of -4). Is it possible to mount a second fan here? I would have to use the D15S as my new case (Phanteks P400S) allows a maximum height of 16cm.