New Swiftech H20-X20 Edge cooling kits

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Since we haven't done the curve of the 35X at minimum speed, it is really impossible to provide a scientifically correct answer. Let's wait for the curves before we speculate.

Pressure scales with square of the RPM and flow scales linearly with RPM. Get a curve at any RPM and you can calculate a curve at any other RPM and it'll be really, really close to actual

D5 P5 (4800RPM): max head in your MCP655 tests is ~4.05 mH2O, max flow is ~20.7 L/min

D5 P1 (1800RPM): max head in your MCP655 tests is ~.58 mH2O, max flow is ~8.8 L/min

Theoretical D5 P1 (1800RPM) based on scaling from above: max head is ~.57 mH2O, max flow is ~7.8 L/min. Factor in the D5 lowers its RPMs a bit at high amp draw/flow at P5+12V (so that the 20.7 L/min actually occurred at ~4300RPM), and the max flow works out just fine. This scaling works on all fans/pumps and across the entire curve, not just the ends (math is one step easier at the ends though )

So taking that and skinnee's DDC3.2+EK V2 data, we can pretty accurately estimate the performance of a 1300RPM DDC based on the DDC3.2 being ~4300RPM.

4300RPM DDC + EK V2 top has a max head of 4.03 mH2O, a max measured flow of 14.2 L/min (at 1.96 mH2O TDH, so not literal max flow due to testbed limitations), and a max flow (via trendline ) of 18 L/min

1300RPM DDC + EK V2 top works out to be a max head of .37 mH2O, a max flow of 5.44 L/min (corresponding to the trendline max) and a point on the curve at 4.3 L/min and .18 mH20.

Max head (with one of the best tops on the market) is 35% lower than a D5 P1 and max flow is 51% lower than a D5 P1. Even with a 5% difference in testbed with your testbed vs. skinnee's, a DDC at 1300RPM is going to deliver flowrates some 30%+ lower than a D5 P1.

This isn't a knock on the MCP35X at all, I love everything about it--warranty on a DDC3.25 with top-notch performing top (I trust your products perform) and with PWM wiring on top of that is awesome. But at the lowest RPM, it will be extremely weak.

EDIT: just to come full circle to Philwong's question, I'll quote myself:

It'll work, but if you increase the speed, temperatures will improve.