Test System & Temperature Results

Test System

Testing Procedure

All testing is done at a room temperature of 23°C (73°F), with a 1°C margin of error. The coolers are tested with Turbo, EIST, and C1E enabled, which will allow the CPU to clock down to a low 1.6 GHz while idle, or clock up to proper speeds under stock and overclocked conditions. The retail Intel Core i7-4770K I use for testing at stock is set to load-optimized defaults with the CPU's voltage at a static 1.15 V. Overclocked, the processor is running at 4.2 GHz on the CPU and 3.9 GHz on cache, with respective voltages set to 1.20 V and 1.15 V. During all these tests, fans are set to run at 100% in the BIOS, with temperatures being recorded by AIDA64.

The idle test will consist of the CPU sitting idle at the desktop for 15 minutes. This will allow for a stable temperature reading that will be recorded at the end of those 15 minutes.

Wprime's and AIDA64's CPU test represent typical multi-threaded loads. Both offer consistent results, with one being a benchmarking application and the other a stability test. Both are run for 15 minutes before the peak reading during the test is recorded and taken as the result. This test lets enthusiasts know what temperatures they can expect to see with games and applications. Wprime is set to eight threads while AIDA64 is configured to stress the CPU, FPU, cache, and system memory.

AIDA64 offers maximum heat generation when set to stress just the FPU in the stability test, which will really push the CPU. This test represents extreme loads much like LinX, Prime95, and other extreme stress tests many users are familiar with.

Idle Temperatures

Cooling performance at Idle is as expected, with Scythe's Katana 4 performing similarly to its primary competitor in terms of size, the Raijintek Aidos.

Typical Load Temperatures

The Katana 4 performs well in our first load test, tying the Cooler Master Hyper 212 at both stock and overclocked settings in Wprime.


Pushing a heavier CPU load with AIDA64's CPU stability test has the Katana 4 again comparing favorably to the Cooler Master Hyper 212 EVO. Sadly for Scythe, Raijintek's cheaper Aidos performs better at stock and rivals it when overclocked.

Max Load Temperatures

Stressing the FPU with AIDA64 almost pushes the CPU to its throttling point when overclocked as it comes in at the maximum permissible temperature of 96°C. Raijintek's Aidos again proves to be the better performer overall, but only by 3°C at stock and 1°C when overclocked.