Review Index:

Koolance EXT-440CU Liquid Cooling System with CPU-380I Water Block Review

Manufacturer: Koolance

Introduction and Technical Specifications


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Koolance EXT-440CU Liquid Cooling System
Courtesy of Koolance

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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.

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

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

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

Continue reading our review of the Koolance EXT-440CU Liquid Cooling System!

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.

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

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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)

Video News

February 11, 2014 | 12:33 PM - Posted by Anonymous (not verified)


For $235 (with out tax) i got a set that easily outperforms this set.

Can be build in a case, and just looks better, because in the end, one of the most important parts the radiator is just way to small.

And spend the same amount as this set cost, then you have something real nice.

February 11, 2014 | 02:49 PM - Posted by Anonymous (not verified)

... your link in in €* ... that's a euro.. not a dollar, euros are worth more.

February 12, 2014 | 09:49 AM - Posted by Anonymous (not verified)

I believe the US shows prices without tax, so I did the math.

€215 - 19% tax = €175 = $235

February 11, 2014 | 01:44 PM - Posted by Anonymous (not verified)

Was the block mounted perpendicular to the memory slots? This is the optimal config for the 380i, matters by 1.5 degrees. I have the 380i block in my loop.

February 11, 2014 | 01:56 PM - Posted by Anonymous (not verified)

The radiator isn't too small, Koolance has been making good watercooling gear for along time. As for mounting the block perpendicular to the RAM, that is dependent on the motherboard chipset and if the motherboard is even a reference design. Chances are, the only reason someone has seen a difference is that at a certain angle the hoses were putting pressure on the mounting and screwing with the thermal joint between the waterblock and the processor.

February 11, 2014 | 02:08 PM - Posted by Koolance (not verified)

I think it should be emphasized that the water kits being compared (XSPC EX240 and Corsair H100i) are both dual-fan radiators. EXT-440CU is just a single-fan radiator unit. Koolance's dual-fan rad external unit is EX2-755.

February 11, 2014 | 03:06 PM - Posted by Anonymous (not verified)

Yes, I think anybody that would go this route (external unit) would go for 240mm model .

Little OT but may I ask why the 4400 OC is done with a 42x by 105 blk , instead of straight 44x by 100blk . Is it is easier voltage wise for 42x@105mhz ?

February 11, 2014 | 03:19 PM - Posted by Morry Teitelman

Those specs were used for the Z77 board because they were there stable o/c specs from when the board was originally reviewed.  Using a 105MHz base clock atually puts the system under a little more stress than with a 100MHz base clock, requiring more voltage to stabilize..

February 11, 2014 | 03:15 PM - Posted by Anonymous (not verified)

Also Should of reviewed the Ex2-755 V2 as its almost same price ( $285) . Which is 240mm and probably look good on top of case if it has flat top .

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