If the NB is as hot as all that then I'd suggest routing the two loops a bit differant.
Loop #1
Rad=>CPU=>NB=>pump
Loop #2
Rad=>GPU1=>GPU2=>pump
My reasoning is that this would more nearly equalize heat load.
If CPU is @ 100w & NB @25w (guess) = 125w total
If GPU's are both at 50w = 100w total
I would prefer this as if you combine the CPU with a GPU you then get 150w vs 75w on the loop with GPU + NB.......should improve both the CPU temps and balance the GPU temps better.
Blocks
CPU => TDX with #4 jet installed & brass top to avoid corrosion risk, or.....Storm G4 or G5 both of which have non corrosive tops.
GPU => Silverprop Fusion with brass top X2 or Danger Den maze 4 if they now have brass topped versions.
Chipset=> Danger Den Maze 4 with brass top, or Fusion NB block with brass top.
RAD
As someone else posted get the Black Ice Pro which is 1" thick for best performance with those fans. Those are low noise fans you have, very nice, but also low pressure which means a 1" rad will perform better for you.
PUMPs
The DDC 12 pump is very good, low/no noise, and in dual loop can handle with ease the resistence to the above components. Very nice small pumps with high head to flow ratio.
50Z pump from Cooltechnia is also a very good pump with high head and should give a bit higher flows in such a dual loop system, but is also a bit larger to locate two of them and they are also a bit higher dba though they are not loud.
Both will do very well, the DDC is lower noise, the 50Z is higher flow/performance. No big advantage in favor to one or the other, just a judgement for you to make as to which is of more value, noise or flow rate.
If you use any aluminum topped blocks in the loop be sure to add a anti corrosive to the water. I myself do not care for use of aluminum in a loop, but many do so without problems provided they use anti corrosives. Anti corrosives degrade your coolant's performance but they are a must with aluminum in a loop.
You'll have a really really kick butt rig, congrats to you.
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