Test Methodology and Performance
|Category||Model||HEXUS Review||Reviewed Price||Warranty||Product Page|
|Air||be quiet! Dark Rock Pro 4||April 2018||£80||3 Years||bequiet.com|
|be quiet! Dark Rock Slim||May 2019||£55||3 Years||bequiet.com|
|Cooler Master MasterAir MA620P||March 2018||£75||2 Years||coolermaster.com|
|Liquid||Aerocool Project 7 P7-L240||February 2018||£100||2 Years||aerocool.com.tw|
|Cooler Master MasterLiquid ML120R RGB||May 2018||£100||2 Years||coolermaster.com|
|Corsair Hydro Series H100i Pro RGB||July 2018||£110||5 Years||corsair.com|
|Corsair Hydro Series H115i RGB Platinum||November 2018||£140||5 Years||corsair.com|
|Corsair Hydro Series H150i Pro RGB||January 2018||£165||5 Years||corsair.com|
|Deepcool Captain 240 Pro||January 2019||£150||3 Years||gamerstorm.com|
|Deepcool Gamer Storm Castle 240 RGB||July 2018||£96||3 Years||gamerstorm.com|
|Fractal Design Celsius S24||May 2017||£105||5 Years||fractaldesign.com|
|NZXT Kraken M22||March 2018||£90||3 Years||nzxt.com|
HEXUS CPU Cooler Test Bench
|Hardware Components||Product Page|
|Processor||Intel Core i7-8700K (overclocked to 4.8GHz)||intel.com|
|Motherboard||Asus ROG Maximus X Hero||asus.com|
|Graphics Card||MSI GeForce GTX 1080 Ti Gaming X Trio||msi.com|
|Memory||G.Skill Trident Z 32GB (2x16GB) DDR4-3200||gskill.com|
|Power Supply||be quiet! Dark Power Pro 11 1,000W||bequiet.com|
|Primary Storage||256GB WD Black PCIe SSD||wdc.com|
|Secondary Storage||1TB Crucial MX300 SATA SSD||crucial.com|
|Chassis||be quiet! Dark Base 700||bequiet.com|
|Monitor||iiyama ProLite X4071UHSU-B1||iiyama.com|
|Operating system||Windows 10 Pro||microsoft.com|
Our test platform was last refreshed in 2018 and includes a hexa-core Intel Core i7-8700K processor overclocked using 1.225v to 4.8GHz across all cores. The 12-thread chip is paired to 32GB of dual-channel G.Skill Trident Z DDR4 memory set to run at 3,200MHz using the built-in XMP profile.
To get a feel for how the coolers compare, CPU temperature is logged while a large 4K video clip is encoded in multiple passes using the freeware HandBrake utility. The workload tasks all available threads for a prolonged period and, in order to provide a stabilised reading, we then calculate the average temperature across all cores from the last five minutes of encoding.
Actual CPU temperature is recorded and we also graph the delta temperature - that's CPU temperature minus ambient temperature. Last but not least, to give you an idea of cooler acoustics, we use a PCE-318 noise meter to measure overall system noise in both idle and load states.
Our be quiet! Dark Base 700 chassis is set to run with its two stock SilentWings 3 PWM fans - a 140mm front intake and a 140mm rear exhaust - both of which are set to low speed (setting 1) via the integrated fan hub. All CPU cooler fans are set to a 'silent' profile from within the Asus BIOS, and when testing liquid coolers the pump is connected to the motherboard's dedicated water-pump header.
When a radiator is used, it is installed in the roof or rear of the chassis and any bundled fans are configured to push air through the radiator and out of the enclosure.
Those numbers are a pleasant surprise, are they not? We must admit to being a tad apprehensive about using a slim cooler on a Core i7-8700K operating at 4.8GHz across all six cores, but we needn't have worried. Cooling performance obviously isn't as good as some of the best liquid coolers, or indeed be quiet!'s own Dark Rock Pro 4, but considering its size, the Dark Rock Slim delivers respectable results.
And there's more good news. In addition to decent performance, Dark Rock Slim runs nice and quiet at all times. You have to get up close to be able to hear it when the test platform is idle, and though the fan is more noticeable when the going gets tough, the smooth hum remains more comfortable than most of the other coolers on show.