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Review: Fractal Design Celsius S24

by Parm Mann on 10 May 2017, 15:00

Tags: Fractal Design

Quick Link: HEXUS.net/qadg64

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Test Methodology and Performance

Comparison Coolers

Category Model HEXUS Review Reviewed Price Warranty Product Page
Air Cooler Master MasterAir Pro 4 April 2017 £40 5 Years coolermaster.com
Noctua NH-D15S N/A £70 6 Years noctua.at
Liquid be quiet! Silent Loop 240mm October 2016 £115 3 Years bequiet.com
Cooler Master MasterLiquid Pro 280 March 2017 £110 5 Years coolermaster.com
Fractal Design Celsius S24 May 2017 £105 5 Years fractaldesign.com
NZXT Kraken X52 November 2016 £130 6 Years nzxt.com

HEXUS CPU Cooler Test Bench

Hardware Components Product Page
Processor Intel Core i7-6700K (overclocked to 4.4GHz) intel.com
Motherboard Asus Z170 Pro asus.com
Graphics Card Palit GeForce GTX 980 Ti Super JetStream palit.com
Memory Crucial Ballistix Sport LT 32GB (2x16GB) DDR4-2400 crucial.com
Power Supply be quiet! Dark Power Pro 11 850W bequiet.com
Primary Storage 256GB Samsung 950 Pro samsung.com
Secondary Storage 512GB SK hynix Canvas SC300 skhynix.com
Chassis Fractal Design Define R5 Windowed fractal-design.com
Monitor Philips Brilliance 4K Ultra HD LED (288P6LJEB/00) philips.co.uk
Operating system Windows 10 (64-bit) microsoft.com

Benchmark Process

Our test platform includes a quad-core Intel Core i7-6700K processor overclocked to 4.4GHz across all cores and 32GB of Crucial Ballistix Sport LT DDR4 memory set to run at 2,400MHz using the built-in XMP profile.

To get a feel for how the above coolers compare, CPU voltage is upped to an above-average 1.3V and temperature is logged while a large 4K video clip is encoded in multiple passes using the freeware HandBrake utility. The workload tasks all four cores/eight threads for a prolonged period and, in order to provide a stabilised reading, we then calculate the average temperature across all four cores from the last few 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 Fractal Design Define R5 chassis is set to run with its two stocks fans - a 140mm Silent Series R2 front intake and a 140mm Silent Series R2 rear exhaust - both of which are set to low speed via the integrated fan hub. All CPU cooler fans are set to a 'silent' PWM 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 installed, the relevant top ModuVents are removed from the Fractal Design Define R5 chassis, and any bundled fans are configured to push air through the radiator and out of the chassis.


Keeping an overclocked Core i7-6700K processor operating comfortably below 70ºC should be no problem for any of the coolers on show. Fractal Design's Celsius S24 doesn't deliver the lowest temperature, but that's no bad thing as the 'Auto' setting strikes an admirable balance between heat and noise...

...when working flat out the Celsius S24 is the quietest cooler on show. In fact, in our real-world test platform there's no discernible difference between noise level when the system is idle or placed under load. It is always very quiet, an admirable feat for an all-in-one liquid cooler juggling a pump and two 120mm fans.