So.... I received watercooling parts from NCIX. And, uppon inspection everything seemed in good condition. But after installing the block and the GPU backplate on the newly acquired R9 390, I noticed a stain on the backplate. Thinking it was no big deal, I tried to wipe it off. But, no matter what I try, it just wont go away. I've contacted NCIX but considering the fact that I was going to build the loop tonight, I'm pretty pissed.
I'm still looking to fix it if possible, but if not, I'm probably going to install the loop without it and try to install it afterward once its RMA, since it seem possible even with card installed (Not all the screws must be taken of the card in order to install it)
See for yourself. It's pretty weird and EK support was saying that it is most likely a "machine failure/defect". Anyways... Have a look.