Review Index:

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

Manufacturer: Koolance

Included Accessories

Included Accessories

In addition to the EXT-440CU unit, Koolance included a variety of other components and hardware to construct a full cooling loop.

EXT-440CU Liquid Cooling System

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The user manual for the EXT-440CU unit covers everything from setup and install to maintenance and troubleshooting issues. Koolance made sure to explain all aspects of the units operation with tables and illustrations provided to enhance the information presentation.

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Koolance includes a riser card to power the external unit and provide temperature and fan speed data to the external unit. Data and power are passed to the external unit from the riser card via the included serial cable, which plugs into the riser card and the port on the back of the external unit.

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The riser card logic board contains headers supporting up to three temperature diodes and two three pin fan connectors. The power switch header connects to the mother board power switch header allowing for unit initiated system shutdown if any of the measured temperature exceeds the user defined alarm temperatures. The slot adapter contains two pass through holes for the tubing between the unit and the system cooling blocks.

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The riser card includes a total of three temperature diodes, a male MOLEX power connector, and a power pass through cable to connect between the motherboard and the case power button. The MOLEX connector connects directly to a cable from the PSU to power the unit.

CPU-380I CPU Water Block

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Koolance includes an illustrated instruction sheet with the block with detailed information on block mounting and maintenance.

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To mount the CPU block to the motherboard, Koolance includes two backplates, one for LGA 1150/1155 boards and the other for all other motherboards. The included silicon gasket can be used with both backplates. Two sets of uprights are included, the double ended used with the stock LGA 2011 backplate and the others used in conjunction with the Koolance provided backplates. Koolance also includes plastic washers to protect the upper surface of the motherboard, lock nuts to fix the uprights in place, springs and thumbscrews to hold the block in place, thermal compound, an allen wrench to chnage out the block top plate, and metallic tape for use with the included temperature diodes.

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The Koolance provided backplate and uprights use a slotted design to keep the upright secure while installing the CPU block to the mount. The wings on the upright fit in the slots in the upright hole on the baseplate, locking the upright in place to eliminate upright rotation.

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The thumbscrews have a recessed area in which the spring sits, ensuring that the spring exerts consistent and maximum downward pressure on the block. This pocket also minimizes the possibility of the spring slipping out from under the thumbscrew.

Miscellaneous Hardware

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Koolance bundled in a set of their compression barbs for connecting the EXT-440CU to the CPU-380I waterblock. The compression fittings are black aluminum for strength, and powder-coated for scratch resistance. Each barb has flat sections on opposite sides, enabling easy use of a wrench to tighten the inner barb and outer fitting in place.

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For tubing, Koolance included 10 feet of their 3/8 inch by 5/8 inch clear tubing. The tubing is UV reactive as well.

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To fill the cooling loop, Koolance provided a 750ml bottle of their blue colored LIQ-702 high performance coolant. The coolant is non-reactive and its color did not fade during use.

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Additionally, Koolance included a case window appliqué featuring their corporate logo.

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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