EKWB Slim 240 Liquid Cooling Kit Review

An open loop kit is probably the best way to jump into custom liquid cooling. It means you get everything you need inside one convenient box. No worrying that you forgot one part or another. No fretting that you accidentally got the wrong sized tubing or that your pump won’t work with your reservoir housing. To top it off, kits are usually less expensive than buying all the same parts à la carte.

Last year we saw EK’s Performance line of kits blow away even the best AIO liquid coolers. Today we’re looking at the much cheaper little brother, the Slim 240. At only $200, it’s not much more expensive than a premium AIO and almost half the price of the Performance 280 and 360. If it can keep up with the big boys, we might see our first true value award for liquid cooling.


The Slim product line is EK’s lowest-tier kit, offering three different versions based on radiator size. The Slim 240 we're testing uses a dual 120mm radiator. A Slim 120 and Slim 360 are also available. While the Slim kits are the least expensive EK offers, the components inside are the same EK sells individually. These kits use solid copper water blocks and radiators, not cut-rate parts.

Water Block

The Slim kit uses EK’s Supremacy MX water block, the same used in the company's Predator expandable AIO coolers. It features a solid copper cold plate with a mirror polished bottom. The top is clear polymer with a black anodized brushed aluminum cover plate. The two ports up top use the common G1/4 threading for fittings. The manual clearly shows the proper flow direction for the ports, though it’d be better if the block itself were labeled. Instead of the pre-mounted Intel bracket that comes with the Predator and most standalone MX blocks, the Slim 240 includes the EVO’s universal mounting kit, supporting LGA 115X, 2011(-3), 2066, AM3, and AM4 sockets. If you order directly from EK, the company will even throw in additional mounting hardware for AM2 and FM2, or LGA 775 and 1366 for just a penny.


The dual 120mm radiator in the Slim 240 is EK’s SE 240. It uses a solid copper core for both fins and tubes, while the end chambers are brass. The exterior frame is steel and aluminum. Like most loop components available today, it uses G1/4 threads on the two ports at the end. It's worth discussing the radiator’s thickness, or rather thinness. Most basic radiators from other manufacturers are 30mm thick, but the SE 240 is only 25mm thick. While this slightly diminishes the overall surface area for cooling, it does make the radiator a little easier to fit in tight cases. To help make up for this lack of girth, EK stacks the core with 22 fins per inch (FPI).


You need a capable fan to work with a 22 FPI radiator, and the Vardars included in the Slim 240 kit deliver. These are the F3-120 variant, not the F4-120ER that came with the Predator and Performance kits last year. Both share the same scooped seven-blade design, but the F3 has a lower maximum speed than the F4: 1850 RPM compared to 2200 RPM. It also doesn’t have the extended PWM range that gives the ER variants their name, so the fan can only slow to 50% instead of 25% duty cycle.


The pump included in the Slim 240 is an SPC 60A with XRES 100 reservoir combo volute. It looks like a DDC variant, and perhaps you can think of it that way. The SPC uses the same basic design as the DDC and the same dimensions. It’s actually compatible with many DDC tops and volutes.

The SPC has two large advantages over the DDC. First, it spins much slower and is therefore much quieter. Second, the slower pump motor draws a maximum of 6W (higher performing DDC and D5 pumps can pull as much as 20W). That means it doesn’t need a direct Molex connector to a power supply. Instead it uses a single 4-pin PWM cable and draws power from the motherboard. Fewer cables in a case is always welcome. Lower power consumption also means lower heat generation, another problem that often plagues DDC pumps.

However, the lower pump speed also means a lower maximum head pressure and flow rate compared to some pumps. The SPC performs roughly on par with slower DDC pumps like the 3.1 series. DDC 3.2 and D5 pumps can produce twice the pressure and flow rate, but only at high speeds where noise becomes a big issue. When run at quieter speeds, these pumps would be closer to 50% more powerful. However, the SPC is practically inaudible even at full speed, meaning you don’t need to choose between performance and quiet operation. If you do want some extra control, the SPC’s PWM range is 20% - 100%.

The XRES 100 reservoir has a volume of 125ml and comes with both an anti-vortex paddle and foam insert. The reservoir tube is acrylic, although the rest of the housing and volute are injection plastic instead of machined POM to save costs. The pump has two G1/4 ports, which are clearly labeled "in" and "out." The kit also comes with a 120mm mounting bracket and vibration dampening feet for the pump.

Tubing & Fittings

Two meters of EK’s DuraClear 13/10 PVC tubing is included in the kit, all in a single length so you can trim it to your particular needs. Six nickel-plated brass compression fittings are also in the box to secure the lines to the individual components. EK machines their fittings on the inside so a large hex wrench (included) can tighten them in place.


Apart from the loop components and tubing, EK includes all the other odds and ends you’ll need to quickly and securely set up your cooling loop. A 100 mL bottle of EK's new coolant concentrate, CryoFuel, comes in the box and is enough to mix a full liter of coolant (use only distilled water). You also get a PSU bridge and SATA power adapter for the pump to fill and test your loop without having to power the motherboard and CPU. Two additional cables are also included: a 4-pin splitter cable for the fans and 4-pin extension cable.


As I wrote in the Performance 360 review, even though kits make it easier to get all the necessary pieces together, it's still far more time consuming to install a custom loop than an AIO. As always, fully rinse out the cooling components with distilled water to remove all traces of the manufacturing process, such as acrylic shavings or loose solder blobs. These can and will get caught in the water block microfins and the radiator tubes, decreasing cooling capacity.

Once everything is clean and reassembled, use the included wrench to firmly affix the fittings to the water block, pump, and radiator, and decide where you want the radiator and pump to be situated in your case. Because the tubing in the kit is a single length, you can cut it to whatever length suits your case the best, allowing you to position the radiator anywhere you want in your case, using the fans as either push, pull, intake, or exhaust. This isn't always an option with AIO coolers.

After you've got the parts arranged, measure and cut the tubing to fit. It's always best to cut the tube a little long and trim again if necessary. Also, don't try to bend the tube too tightly or it will collapse and restrict coolant flow. When ready, slip the fittings' compression rings onto the tube (threads facing the ends) and gently but firmly push the tube lengths onto the fitting barbs on each component. Tighten the compression rings to secure the tube to the components.

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