Review: Deepcool Assassin III

by Parm Mann on 1 October 2019, 14:01

Tags: Deepcool

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Test Methodology and Performance

Comparison Coolers

Category Model HEXUS Review Reviewed Price Warranty Product Page
Air be quiet! Dark Rock Pro 4 April 2018 £80 3 Years
be quiet! Dark Rock Slim May 2019 £55 3 Years
Cooler Master MasterAir MA620P March 2018 £75 2 Years
Deepcool Gamer Storm Assassin III October 2019 £80 5 Years
Noctua NH-D15 April 2014 £80 6 Years
Noctua NH-U12A May 2019 £90 6 Years
Liquid Aerocool Project 7 P7-L240 February 2018 £100 2 Years
Asus ROG Ryujin 360 May 2019 £232 3 Years
Cooler Master MasterLiquid ML120R RGB May 2018 £100 2 Years
Corsair Hydro Series H100i Pro RGB July 2018 £110 5 Years
Corsair Hydro Series H115i RGB Platinum November 2018 £140 5 Years
Corsair Hydro Series H150i Pro RGB January 2018 £165 5 Years
Deepcool Gamer Storm Captain 240 Pro January 2019 £150 3 Years
Deepcool Gamer Storm Castle 240 EX June 2019 TBC 3 Years
Deepcool Gamer Storm Castle 240 RGB July 2018 £96 3 Years
Fractal Design Celsius S24 May 2017 £105 5 Years
NZXT Kraken M22 March 2018 £90 3 Years

HEXUS CPU Cooler Test Bench

Hardware Components Product Page
Processor Intel Core i7-8700K (overclocked to 4.8GHz)
Motherboard Asus ROG Maximus X Hero
Graphics Card MSI GeForce GTX 1080 Ti Gaming X Trio
Memory G.Skill Trident Z 32GB (2x16GB) DDR4-3200
Power Supply be quiet! Dark Power Pro 11 1,000W
Primary Storage 256GB WD Black PCIe SSD
Secondary Storage 1TB Crucial MX300 SATA SSD
Chassis be quiet! Dark Base 700
Monitor iiyama ProLite X4071UHSU-B1
Operating system Windows 10 Pro

Benchmark Process

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.


The Assassin III and NH-D15 are the heavyweights of twin-tower coolers, and it comes as no surprise to find the duo competing at the top end of the chart. Both are ideally suited to our Intel Core i7 processor, overclocked to 4.8GHz across all cores, and though performance is almost identical, the newer Deepcool just about edges it.

Keeping a CPU cool is only part of the puzzle for a modern-day build, the real trick is shifting heat while creating as little noise as possible. In this test, the tables are turned; Assassin III is wonderfully quiet when idle, but the NH-D15 is that extra bit quieter under load. These are fine margins, mind, and both coolers are ultimately among the best on the market. Do note that adding the low-noise fan adapters reduces noise levels to sub-34dB, albeit at the expense of cooling performance.