Testing methodology
Everything needed (monitor, peripherals, motherboard w/CPU and GPU, radiator, PSU and so forth) was placed in a sealed climate controlled box at 25 +/- 0.05 ºC. Each radiator was connected by Koolance QD3’s for easier changing of fans and radiator. The flowrate was held at 1 GPM constant. The CPU, an Intel i7 4770k at 4.6 GHz and 1.3 Vcore, was held at a constant load using a custom XTU profile and the GPU, an EVGA GTX 780 Ti Classified KPE under load from Unigine Heaven 4.0 at 1080p/extreme HD settings, was overclocked and overvolted such that the total system power draw was 650w as measured by a power meter. A near constant heat load into the liquid loop helped achieve stable liquid loop temperatures (as measured by 3 separate in-line temperature sensors hooked up to the AQ6) pretty quickly. The tubing and fittings were insulated by a heater sleeve with the heat function not being utilized. Every single measurement was done twice to be sure. Any possible effects of running a fan outside of a static max speed was minimized as much as possible by using a comprehensive series of fans to cover a broad RPM range.