Watercooling manifold or loop?

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What is the best option for the following:
I am water cooling my cpu atm and am adding 2 full cover gpu blocks, i have made up two aluminium manifolds and am thinking of running flow into one manifold and diverting off three ways to the cpu and two gpu blocks. Then on return side they return to other manifold and back to res then pump then radiator ,then back to flow.
Would it be better to use manifolds or to loop tubing from cpu-gpu-gpu then back to res.
Im thinking using manifold all three blocks will get fresh cooled water rather than heated up water from previous blocks on looped system.
Manifolds have been made with 1/4 bsp fittings and inside of manifold is 14mm in diameter,they would be located on base of case.
Thanks in advance :)
 
Current thinking is that the loop equilibrates after a certain period so wither will give the same temperature eventually. Generally, I think the loop is more straightforward and should give less pressure fluctuations across the circuit.
 
Plus manifolds or just t-peices run the risk that all components will not get equal flow of water.

Water wil go the route of least resistance and if one branch is longer/more restricted than another, the flow through that branch will be slowed.

My personal perference is series. And as WJA96 says, after several mintues the water in your loop will be running at the same temperature throughout the system anyway.
 
Blocks in series.

After a few minutes there is no " cooler " water .

( Well not noticable cooler , fractions of a degree as it leaves the radiator possibly)

Your temps are governed by how much heat you can shift through cooling , rather than any block order.

Copper and Alu in the same loop is a no. Too close chemically ( See Periodic Table ) and will react together.
 
Loop tbh, several loops if you can afford it, i've gone that way simply because my GTX pumps out loads of heat and when i go dual X2's they will need a good amount of cooling alone.
 
The blocks are copper and manifolds are aluminium(anodised now).Thing is im sure my rad is aluminium not copper.
im thinking best bet might be a seperate loop for gpu's and keep my current loop on cpu as it is.

Thing is im currently making a chiller for my system and this has climate control so i wont need to insulate,will keep water temp at around 15-20c as im also getting ac fitted to my pc room in few weeks which will keep my room cool and help me keep water cooler than normal(when pc in use of course).
In this case i think manifolds would be best to distribute the water in a single loop, also does specific coolant not help against various metals in loops?

Decisions decisions:eek:
 
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