Thermal Performance

Test System

Test Methodology

A Xylem D5 pump, Aquaero 6 XT controller, and an EK-Quantum Surface X360M radiator with Phanteks T30-120 fans help complete the loop. The GPU is not placed in the loop to make the only source of heat the CPU, thus limiting testing to the CPU block itself. Average flow rate is set to 1 GPM and calibrated in-line temperature sensors are used to measure the coolant's temperature. Everything required is placed inside an environmental chamber with the ambient temperature set to 25 °C. Thermal paste cure time is taken into account, and three separate mounts/runs are done for statistical accuracy, and to remove chances of any mounting-related anomalies. For each run, a custom Prime95 test with small FFTs and AVX2 load is used, looping for 30 minutes, and CPU core temperatures are measured using AIDA64 with the average core temperature recorded at the end of each run. A delta T of CPU core and loop temperature is thus calculated for each run, with an average delta T that is then obtained across all three runs. This way, the cooling solution is taken out of the picture.

Test Results

Note that metal top blocks—such as this Granzon GAISC, even with the POM body—tend to perform slightly better than the non-metal top blocks in my environmental chamber with active ventilation, owing to more uniform and efficient heat distribution. There are some blocks here which are socket-specific, and others offer increased compatibility. The GAISC, for example, supports multiple Intel sockets, including older ones. As a result of this, and knowing the cooling engine + block design isn't the newest, I was still impressed to see it performing so well near the top of this chart. Goes to show that simply having an increased heat transfer area with more fins can help, even if it is the simplest trick in the book. Once again, it's real close between this and the Bykski CPU-FIRE-ON-I as hypothesized before, although the thicker block with more metal and coolant volume inside might have edged this ahead—still within error margins.