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Liquid Flow Restriction

Testing methodology

I used a Swiftech MCP50X pump with a FrozenQ 400mL cylindrical reservoir. 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- in this case each radiator. Every component was connected by 1/2″ x 3/4″ tubing, compression fittings and 2 T-fittings with the manometer.

Results and discussion

We see that the Nemesis GTR 480 is indeed less restrictive than the Nemesis GTX, and the older GTX, with an average pressure drop of 0.4 PSI at 1 GPM of average coolant flow. It is still average at best despite the radiator thickness and the dual core as a result of the thin coolant tubes used. But for those complaining about the higher liquid flow restriction from the Black Ice Nemesis radiators, this will be a respite.

For further context, here it is relative to an average restriction CPU block:

You should really be worried only when the total restriction from your rads comes real close to that of the CPU block. Given many will have 560 mm total radiator space on average, these radiators by themselves will not factor much in your decision of pump purchase.


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