I suspect its either a difference in the pump motor/impeller and or a difference in testbed t fittings or the manometers. I did all my testing on the same exact pump motor/impeller to ensure good relative data, but it wouldn't surprise me to see some varience in the performance levels between pumps. I saw some of that with different D5s. I also made my own 1/2" copper to 1/8" brass fittings to connect my manomter to. Theretically and pressure errors should cancel out if measuring pressure difference, but there could be some influences we are missing. Also calibration of the manometers..probably some differences there too. I never had mine calibrated..mine could be reading highfor all I know..
Bottom line..different test beds....we can hold precision and have very good comparative data on the same test bed, but I we don't know how accurate the testing is without some sort of check. Soo, results from two different test beds shouldn't be combined or compared..you would need standardized proceedures, equipment, and calibration efforts which we don't have nor is there any interest to do so...we already donate our free time and paid for the equipment.
It would take a manufacturer to develop a standardized testing specification to get to a cross test bed level of testing accuracy along with precision. As hobby testers...were making up the specs as we go and constantly changing them...no incentive for us to do otherwise.
IMHO the same thing could be done for all of water cooling testing including cpu/gpu c/w testing, but it would take several manufacturers to come to some agreements on the testing specification.
No one has stepped up to that plate yet..
Hopefully one day..
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