I don't know what your system consists of, but if you were to use this pump with a DTEK TC-4 waterblock and a heater core equivalent to the Big Momma that BillA tested, and add say 10% to the flow resistance for tubing etc, that pump would get you a flowrate of about 8.5 lpm. (510 lph or 135 gph)
I figure about 6.8 lpm for the Danner Mag 3 in the same setup.
Looking at BillA's C/W vs flowrate curve for the DTEK TC-4, the thermal resistance is about 0.004 C/W better with a flowrate of 8.5 lpm than it is with a flowrate of 6.8 lpm. If the water cooling system is removing 100 Watts of heat from the CPU, the CPU will be 0.4C cooler with the 8.5 lpm flowrate IF YOU EXCLUDE THE HEAT THE PUMP PUTS INTO THE WATER.
The pump is definitely putting a signifcant portion of the power it consumes, into the water as heat. Most likely the increase in water temperature due to pump heat will exceed that 0.4C gained at the waterblock.
Unless you have a system with substantially less flow resistance than a TC-4 and a heatercore, you have a big, expensive, power hungry pump which may well give you worse results than a Danner Mag 3 would.