Fractal Design Kelvin S24



Fractal Design is a Swedish company known for their minimalist design of their products. The color scheme present in F.D products is black and white, scheme present in cases, power supplies and fans.  The concept of Fractal Design is to provide products with an extraordinary level of design, without compromising the important factors of quality, functionality and pricing.


Official product link:

Packaging and accessories

The Kelvin S24 model comes packaged in a black box with blue accents.
On the front side of the box is printed a general picture of the product. On the top there are printed the name & logo of the manufacturer, while next we find the name of the product.
On the lower right corner is printed the website of the manufacturer.

The sides of the box present the features & specifications of the product.

The back of the box briefly presents the product and its features.  On the lower side there are two photos of the radiator and pump-block assembly.


The product comes with the following accessories:
–    1x User’s manual
–    1x Fractal Design Zero™ Thermal Paste
–    1x 4-Pin PWM splitter
–    4x Mounting screw springs
–    4x Mounting screw washers
–    4x Mounting screw nuts
–    4x Intel 2011 Mounting Screws
–    4x AMD Mounting Screws
–    1x Backplate
–    4x Intel Mounting Screws
–    2x Intel Bracket
–    2x AMD Bracket


Model: Kelvin S24
Colors Available: Black
Supported sockets:
Intel: LGA775, 1150, 1155, 1156, 1366, 2011, 2011-v3
AMD: AM2, AM2+, AM3, AM3+, FM1, FM2, FM2+
Model: Alphacool DC-LT
Pump Specification:
–    Ceramic bearing
–    2400 RPM
–    Voltage control
–    Maximum water flow: 72 l/h
–    Maximum pressure: 1.0 m H2O
–    Acoustical noise: 25.0 dB(A)
–    DC 12V, 0.27A
Tubing Measurements: 320mm long, 11mm outer and 8mm inner diameter
Fans included: 2 pcs
Model: Fractal Design Silent Series HP 120 mm/Fractal Design Dynamic GP-12 PWM
Fan Specification:
Dimensions: 120 mm x 120 mm x 25 mm
Fan Speed: 800 – 1700 RPM (PWM)
Fan Airflow: 62.4 CFM (Max)
Fan Noise: 26.9 dBA


–    Expandable system. Just open it up to get the full benefits of custom water cooling, with the ability to add any components you want to the loop, such as a graphics card cooler.
–    Standard G 1/4″ thread fittings for compatibility with the vast majority of enthusiast water cooling products.
–    Made with enthusiast-grade components developed in cooperation with Alphacool.
–    Full copper CPU Water block design featuring strategic jet plate improvements.
–    Tubing features anti-kink coils.
–    Easy refilling with dedicated fill port. Extra strong fill port that can be accessed by hand, with an Allen key or with a coin for easy durable handling.

Visual inspection

The Kelvin S24 model has a minimalist design, similar with the design of the Define line of cases. The cooler is accompanied by two 120mm fans, Fractal Design Silent Series HP, which feature PWM and have a minimum speed of 800 RPM and a maximum of 1700 RPM.
The radiator used in the case of the Kelvin S24 measures 275mm in length and 124mm in width, having a thickness of 30mm.

The radiator features a Low FPI (fins per inch) design, thus the fin density is lower and the radiator does not require high speed fans in order to obtain a good performance.

The CPU block has a minimalist look; the top side has a glossy texture while the sides are matte black. In the lower right corner, we find the “Fractal Design” logo.

The block uses two 90° brass fittings which pivot thus offering the user more flexibility during the installation.

The base of the CPU block is made out of copper and held in place by four copper screws.

The cooler uses two tubes, each having a length of 320mm and a outer diameter of 11mm. The tubes utilize standard G 1/4″ fittings.

The pump cable is covered by black sleeving. Also it uses a 3-Pin Molex Connector.

In the case of the latest revision, the two Fractal Design Silent Series HP fans have been replaced with two Fractal Design Dynamic GP-12 PWM 120mm fans. Below we have a list of the changes made between revisions:
–    Add low pump speed cable
–    Change PWM splitter to no-mesh version
–    Change radiator screws to PH2 heads
–    Change fillport to add a coin slot, harder to break
–    Update box and manual



The following system was used to test the cooler:
–    Processor: Intel i5 4690K @ 3.9 GHz and overclocked to 4.5 GHz
–    Motherboard: MSI Z97 Gaming 9 ACK
–    RAM: 8GB Crucial Ballistix Tactical @ 2133MHz
–    GPU: MSI GeForce GTX 660 OC Gaming
–    SSD: Samsung 840 EVO 120GB
–    HDD: Samsung SpinPoint F3 500GB
–    PSU: Seasonic M12II-520 EVO Edition Bronze 520W
–    Display: AOC i2769VM
–    Case: Phanteks Enthoo Luxe White
–    Thermal compound: Arctic Cooling MX-4

Software used for testing the cooler:
–    AIDA64 Extreme Version: 5.80.4000 (Oct 25, 2016)
–    Intel Burn Test v2.54
–    Prime95 28.5

The cooler was tested with the CPU at the default turbo frequency of 3.9 GHz and overclocked to 4.5 GHz with a core voltage of 1.187 V.
Also the included fans have been used at their maximum speed.
The room temperature was approximately 26°C (78°F), with 1°C margin of error.
The idle test consists of the CPU sitting idle at the desktop for 30 minutes, the temperature was measured at the end of the test.
The settings of the software used are the following:
Intel Burn Test v2.54 – Stress level: Maximum
Prime95 28.5 – small FFT
AIDA64 Extreme Version – Temperature monitoring.
Each test was conducted for 40 minutes.

The test results are as follows:


Full Load


The noise level was measured at three different distances from the fans (10cm, 20cm, 30cm.) the noise was measured with a margin of error of ± 5 db.

Final thoughts

The main feature of the Kelvin S24 model is the possibility of expanding the cooler, thus offering flexibility in long term use. During testing the cooler was good, the installation process was easy and the temperatures very good.
The build quality and the materials used are very good, the cooler uses standard G 1/4″ brass fittings.
Fractal Design updated the cooler adding a plus of performance and making the installation process even easier.
In conclusion, the Kelvin S24 model stands out thanks to its modular design and performance with the minimalist look characteristic of Fractal Design.

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