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Liquid flow restriction

Testing methodology

I used a Swiftech MCP50X pump with a FrozenQ 400mL cylindrical reservoir filled with distilled water. The pump was powered by a direct SATA connection to an EVGA 1300G2 PSU, and was controlled by an Aquacomputer Aquaero 6 XT. There was an in-line flow meter previously calibrated, as well as a Dwyer 490 Series 1 wet-wet manometer to measure the pressure drop of the component under test. Every component was connected by 1/2″ x 3/4″ tubing, compression fittings and 2 T-fittings with the manometer.

It’s at the point where that plot is cluttered with data. So here’s another which might be more helpful:

In case you can’t view the interactive image properly, here’s a direct link comparing the tested CPU waterblocks available for retail purchase: Pressure drop of CPU waterblocks at 1 GPM flow

The Alphacool Eisblock XPX tested to be among the more restrictive CPU water blocks today. The ~0.2 mm thick microchannels in a relatively large area meant that the coolant has to struggle to flow through before exiting, and the ramp and flow distribution setup while possibly helping with a uniform distribution did also reduce flow rate further based on what I see. It is more restrictive than the predecessor XP3 Light which is what I am seeing with most CPU blocks lately, but if you are planning on using this block then account for the higher than average pressure drop with a pump that has a sufficient head pressure accordingly. Let’s take a look at thermal performance on the next page now.


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