Need a very good water block

[storm-chaser]

I have a heatkiller IV all copper waterblock at the moment. It is a great water block but very restrictive. I have three pumps, one before and two after the restriction which provides enough flow but the pumps are working harder than they should be. I want to remove the heatkiller and find something on par, but yet slightly less restrictive so I can continue to have good flow through the loop.

This rig is used specifically for cold weather benching, and I am running 40% methanol as coolant. Any suggestions?

 

[Drumroll]

Tried in the past some more restrictive waterblocks and radiators and apart from the negative impact on flow, not worth.
I was using the Alphacool https://www.overclockers.co.uk/alph...-block-plexi-black-digital-rgb-wc-0av-ac.html .
Looks good, good performance but slightly restrictive compared to EKWB's.
Depending on which chip you're using, the position of the intake (of the block) will have a greater impact on performance than anything else, considering the fin area is enough.
With a less restrictive block you may fine tune the pumps to achieve the perfect balance where the coolant spend enough time in the block and in the radiators for maximum efficiency. Using dual D5 in some builds, going with higher flow never returned the best temperatures.