I'm wondering about how quiet it would be reasonable to a assume a CPU and GPU custom WC build could be compared to say a Kraken x62 cooling a 3570k and say an ASUS GTX 1070 Strix with its own cooler. To narrow the variables, if only just a bit, my thoughts on a custom loop would be an EK-D5 PWM G2 running at low RPM. In regards to the radiator, I'm not entirely would be enough to cool my 3570k and a (probably coming) GTX 1070, but I'm thinking a 280 or 420 rad with EK-Vardar F1-140 (1150rpm) fans. My Kraken x62 is currently doing a pretty good job of cooling my 3570k (with a 5 GHz OC it currently goes to 60-70 celsius when under full load, using the silent mode). But ultimately I want to do a scratch build and I'm trying to figure out what would be the lowest noise option. Thought the experienced people here could be of help, all feedback appreciated.