The simple answer is no matter what order you put things the temps will be the same,,Pump block rad .Pump rad block makes ZERO difference.
I'd like to say FALSE.
It DOES make a difference. How big of ad ifference? VERY VERY SMALL. But it DOES make a differnce so saying "It makes ZERO difference" Is FALSE.
If your saying it makes zero difference your basically saying the pump and cpu generate NO heat. Which is false.
Yes they generate very little heat, and the water may only heat up 0.05c, or 0.2c, but it STILL makes a difference.
Now honestly I say just hook it up in whatever order you feel like. But you cannot possibly say it makes no difference, just say that it makes very small difference that you shoulden't worry about.
Now what im curious about, as everyones saying you need the most pressure over your cpu.. How much of a difference does that make? I mean, more pressure means more cooling, BUT you can look at it from a different stand point... Pressure creates heat, how much heat will 2psi or hwatever our loops are running at create? Maybe only 0.05c, but it STILL is creating some heat. So does the fact you have high pressure going over your block help more then running low pressure? I don't know thats up for discussion..
But the bottom line is if your THAT worried about temperatures, you need a new hobby. .5c will NOT change anything. 5c probably won't yield you a better overclock.
Now building a chiller and getting 30c lower temps will make a difference, probably a very big difference in your overclock.
My $0.02.. And I promise you won't see me wasting time changing my flow pattern up to see a 0.02c drop in temps. Im just fine with 32c full load
I want to end with this..The easiest weay to plumb the rig with the least amount of tubing and bends IS THE BEST advice that can be given..If that means the RAD goes after pump and before CPU great ,If it means the system is res,pump,gpu,cpu,rad THEN dont worry about it because even mathmatically the difference is a fraction of 1c..
Any one here ever get a better over clock at 37c then at 37.019c ? ? ? ?
Yes I agree fully here. The easiest way and best looking way to plumb your rig is 100% the best. Don't waste time getting the perfect flow pattern to see 37c over 37.019c