Welcome Jungle!
As much as I like freezing stuff, water loops are still an integral part of my overclocking.
My main rig and the kid's rig are both watercooled and the benching station always has a couple of loops with 3-6 blocks (CPU, NB, GPU's) mounted on it for cooling whatever needs to be cooled.
90cfm from a 25mm fan won't get you near the performance of a 38mm because of less static pressure.
Likewise, a thinner rad is different than a GTX or a feser xchanger.
Also depends a lot on your overvolt and OC. Overvolted 480's (and 980x of course) put out WAY more wattage than stock.
I agree with Rom that a double + triple rad are fine, and loop order doesn't matter. But I don't think you need 2 loops. Your single 655 will handle 3 blocks and and 2 rads fine. My 24/7 with a single 655 pump has done fine with 120+480 rads, CPU block, full chipset block (classified), and 2 GPU blocks without a hiccup.
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