Apparently cpu0 runs hotter than cpu1 on these, cpu0 is the one on the right, so although I know that theoretically a loop stabilises in temp over time, I always feel in my water that the first component in the loop after the pump gets cooled more.
I was going to go into cpu1 first (the left cpu) so go:
Pump/res -> cpu1 -> pwm -> cpu0 -> chipset -> rad -> Pump/res
But now I think:
Pump/res -> cpu0 -> cpu1 -> chipset -> pwm -> rad -> Pump/res