Introduction and Technical Specifications

We take a detailed look at Koolance’s EXT-440CU Liquid Cooling System paired with their CPU-380I CPU waterblock…


Koolance EXT-440CU Liquid Cooling System
Courtesy of Koolance

Koolance CPU-380I CPU Water Block with Intel CPU mounting plate
Courtesy of Koolance

Koolance has effectively transformed itself from a minor player in the cooling community to a powerhouse at the forefront of high performance liquid cooling products. Koolance recently released the EXT-440CU Liquid Cooling System, an apparatus integrating the cooling system's reservoir, pump, and radiator into an aluminum assembly. In addition to the EXT-440CU unit, Koolance provided us with their CPU-380I CPU water block for testing as a complete kit. We tested the Koolance kit in conjunction with other all-in-one and air coolers to see how well the Koolance kit stacks up. The EXT-440CU Liquid Cooling System retails at an MSRP of $274.99 with the CPU-380I water block available for a $74.99 MSRP. While not the cheapest solution, the adage "You get what you pay for" fits the bill for this Koolance kit.

Koolance EXT-440CU Liquid Cooling System, side view
Courtesy of Koolance

Koolance EXT-440CU Liquid Cooling System, rear view
Courtesy of Koolance

Koolance CPU-380A CPU Water Block with AMD CPU mounting plate
Courtesy of Koolance

The Koolance EXT-440CU Liquid Cooling System unit incorporates a cylindrical reservoir with the Koolance PMP-330 water pump and a copper-based 120mm radiator. The unit has integrated female G1/4" inlet and outlet ports, allowing for easy integration into an existing or new water loop. It features an aluminum housing design with a serial cable attaching the main unit to the included rear panel for power and temperature data transfer from the included temperate diodes. The CPU-380I water block is a solid copper-based block with nickel plating for added corrosion and scratch resistance to the block. The water block also includes integrated G1/4" female inlet and outlet ports.

CPU-380A CPU Water Block AMD kit
Courtesy of Koolance

CPU-380I CPU Water Block Intel kit
Courtesy of Koolance

For their CPU-380 CPU water block, Koolance sells two different SKUs for the Intel and AMD CPUs – the CPU-380I water block for the Intel-based socketed motherboards and the CPU-380A water block for the AMD-based socketed motherboards. The difference between the SKUs is the block mounting mechanism with the block internals shared between the SKUs. Koolance also offers the Intel and AMD mounting kits separately, alleviating the need to purchase a separate block for use with a different CPU.

Technical Specifications (taken from the Koolance website)

EXT-440CU Liquid Cooling System


5.50 lb (2.49 kg)

Product Dimensions

6.3" x 3.66" x 11.6"
(16cm x 9.3cm x 29.5cm)

Display Type



1 x 120mm (108CFM); 140mm optional

Internal Pump

PMP-300 @ 12V

Power Source

12 VDC (110/220 VAC with Separate Adapter)



Temperature Sensors

10K Thermistors

PMP-300 Pump


0.80 lb (0.36 kg)

Max Flow Rate

7L/min (1.85GPM)

Max Power


Max Static Head

2.6m (8.53ft)

Max Temperature

60°C (140°F)

Native Hose Connection

G 1/4 BSP Threads




Magnetic Centrifugal


6-12 VDC

CPU-380 CPU Water Block


0.36 lb (0.16 kg)


3.75 x 4.50 x 2.25 in
(9.53 x 11.43 x 5.72 cm)

Wetted Materials

Nickel-Plated Copper, Stainless Steel, POM Acetal, EPDM

Socket support

AMD kit (CPU-380A)
AM2, AM2+, AM3, AM3+, FM1, FM2

Intel kit (CPU-380I)
LGA 2011, LGA 1150, LGA 1156/1155, LGA 1366, LGA 775

Koolance LIQ-702 Liquid Coolant


2.10 lb (0.95 kg)



Freezing Point

-15°C (5ºF)

Low Electrical Conductivity


UV Reactive



700mL (23.67 fl oz)
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