Nice setup. I would suggest putting some sort of silicone sealant between the fans and the rad. Stick with the reservoir. A fill port might take up less space but it can actually hurt flow rates. For future reference: watercooling the NV-68's RAM is almost pointless. It uses DDR 3 which is very cool running. Passive air cooling would be more than adequate. That particular block is very restrictive. Not to mention so is your CPU block (though it's a good one, don't get me wrong). With your pump choice, though, I doubt it would have too much of an adverse effect on performance. What fans are you running on your rad?
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