Review Index:

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

Manufacturer: Koolance

Features and Kit Hardware


Courtesy of Koolance

  • EXT-440CU Liquid Cooling System
  • CPU-380I Water Block
  • Clear PVC Tubing, 10mm x 16mm (3/8in x 5/8in)
  • 10mm x 13mm (3/8in x 5/8in) Compression Barb (Black Chrome) x 4
  • Plastic Hose Clip x 4
  • LIQ-702 UV Blue Liquid Coolant, 700mL

Included Hardware

EXT-440CU Liquid Cooling System

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The Koolance EXT-440CU Liquid Cooling System unit combines the cooling system pump, reservoir, and radiator into a single entity, requiring the addition of external power, coolant, and connected cooling blocks to make a functional liquid cooling loop. The enclosure is constructed of aluminum, treated with a scatch resistant flat-black coating. The radiator air-intake and coolant fill port are integrated into the top of the enclosure with a coolant view-port and LED display at the front of the unit.

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The front panel of the EXT-440CU enclosure contains an LED display and a reservoir coolant-level view-port with an acrylic panel overlay to protect the delicate display components. The LED display can be used to monitor system statistics such as fan and pump speeds, as well as temperature for up to three monitored connected thermistors. Additionally, fan and pump speed can be individually configured from the LED display on a speed scale from 1 to 10 with 1 being the slowest RPM speed for both. Below the LED display are four buttons used to configure the display readout and system functioning. The left-most button allows to you manually scroll through the measured components, including the fan and pump speeds. The button immediately to the right sets the device's temperature display mode for either Fahrenheit or Celsius. The two right-most buttons are used to raise or lower the device fan and pump speeds. The fan speed is configured by setting the display to the F screen using the left-most button, while the pump speed can be configured via the P screen.

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The back of the EXT-440CU contains inlet and outlet ports with threaded port covers, port cover holders, and a power/data cable port. Both the inlet and outlet ports are threaded to accommodate G1/4" barbs. When the ports are in use, the port covers can be screwed into the holder holes - to the right of the inlet port and below the outlet port. The inlet port feeds directly into the enclosures reservior while the outlet port connects to the outlet of the radiator. The power/data cable port feeds power, fan speed, and temperature data from the rear panel riser card. Fan speed and temperature data come from devices attached to the riser card.

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The top panel of the EXT-440CU houses the radiator's 120mm fan and the fill-port for the reservoir. The fan is positioned to exhaust air from the top panel and is covered by a wire fan guard. The fill-port of the reservoir can be removed using a coin or a flat-head screwdriver using the metal-slotted plug.

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EXT-440CU Schematic
Courtesy of Koolance

The unit itself measures 12 inches long by 6 inches wide by 3.5 inches high.

CPU-380I CPU Water Block

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CPU-380I CPU Water Block Schematic
Courtesy of Koolance

The Koolance CPU-380I CPU water block consists of the block body with an integrated aluminum hold down plate. The hold down plate fixes to the block with 4 hex screws. The CPU-380I's Acetal top contains two G1/4" ports with the inlet and outlet ports designated by down and up arrows. The water inlet is located close to the block center with the outlet along the top left of the block's top.

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The bottom of the CPU-380I is a nickel-plated, machined copper plate with a highly polished surface. The surface is defect free, making for a perfect mating surface for the CPU. The nickel-plating gives the copper added corrosion and scratch resistance as well. The block assembly screws can be seen at the four corners of the bottom plate in slightly recessed sections to eliminate surface mating issues. Koolance ships the block with a plastic adhesive cover to prevent damage to its bottom surface.

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The CPU-380I water block is securely fixed to the CPU socket with spring-loaded thumb nuts. The thumb nuts fix to threaded posts attached to a plate underneath the socket. The block fits well into the socket area, sized to fit on boards that follow the recommended Intel sized specifications. Notice how the top plate sits high enough from the board's surface to prevent space issues with components located around the CPU socket.

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THe block uprights are fixed in place with steel nuts. The board's surface is protected by plastic washers, which also act to electrically isolate the threaded poles and surface nuts. This is a significant change to Koolance's previous generation hold down mechanism where the threaded posted were screwed in to the bottom plate directly. Using nuts on the board's top prevents issues with the threaded uprights coming unscrewed from the bottom plate, adding a level of security to the hold down mechanism not present in the previous generation design.

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The bottom plate of the hold down mechanism consists of the steel plate and a white silicon gasket. The gasket is thick enough to protect any components in close proximity to the underside of the socket from being crushed. It also acts as an electrical isolation layer between the board and the metal hold down plate and block.

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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