Side Project: Water Cooling My PC


I built my first desktop computer as a teenager when I started to become interested in PC gaming. Since then, I've done multiple iterations and upgrades until I finally arrived at a place where I was comfortable enough to water cool my computer. Water cooling is often done by hobbyists as a way to reduce temperatures and noise, and to enable overclocking hardware components while maintaining good temperatures.

Disclaimer: I do not claim to be an expert on water cooling. If you plan to water cool a PC, this guide is mainly to serve as an introduction to the process and to chronicle my own journey water cooling my PC. It is not comprehensive by any means.

Part List

• Motherboard: ASUS Strix Z370-E

• Processor: Intel i7-8700K

• Graphics Card: EVGA GeForce GTX 1080 Ti SC Black Edition

• RAM: Corsair Vengeance LPX 16GB (2x8GB) DDR4

• Power Supply: Corsair RM750x

• Storage: Kingston 240GB SSD

• Storage: Kingston 120GB SSD

• Storage: WD Black 2TB HDD

• CPU Waterblock: EK-Supremacy EVO

• GPU Waterblock: EK-FC Titan X Pascal

• GPU Backplate: EK-FC Titan X Pascal Backplate

• Pump/Reservoir: EK-XRES 140 Revo D5 PWM

• Radiator: EK-CoolStream CE 280

• Fans: EK-Vardar EVO (2)

• Tubing: EK-DuraClear

• Fittings: EK-ACF Fitting 10/13mm (8)

• Fluid: PrimoChill Vue

• Cables: CableMod ModFlex Pro

• PCI-E Extension: EZDIY-FAB

• Case: Fractal Design Define R6



Building your PC using the original cooling (air) ahead of time if you're building completely from scratch is an important step. This will ensure all of your components work before adding the additional complexity of water cooling. Building a PC from scratch is outside the scope of this write-up, so that's as in depth as I will go here.


Planning your loop properly is one of the most important ways to make sure your components will work together and avoid spending extra money on part incompatibilities. In addition, it is recommended to draw your loop out ahead of time. If you're building your loop alone, measuring tubing lengths is recommended at this stage. I had another person to help me, so we ran the tubing, marked it, and cut it as we went instead.


I had originally ordered an NZXT H500 for this build, then realized the NZXT 500i was the only version with the ability to vertically mount the GPU. As this was a core component of the build asthetic I was going for, I re-ordered an NZXT H500i and had to wait for it to arrive. Once it arrived, I started to dry fit the reservoir/pump and the raditator, only to realize they wouldn't fit in the case without a massive amount of overcrowding. An important note is that the NZXT H500i is a brand new case, so I didn't have many reviews to go off of and just went on hope. This is where you do as I say and not as I do, and plan ahead of time so it doesn't happen to you.

More Fitting

After realizing my second case also didn't work, I did an extensive amount of research and landed on the Fractal Design Define R6 in white. I watched countless YouTube builds with watercooling to make sure it would actually fit. I had to wait another week for this case to arrive, but when it did I could finally do another dry fitting.

Dry fitting of reservoir


I started this build by installing the power supply and routing the cables through the case to get them exactly how I wanted them. This is a good first step especially if you want clean cable management throughout.

Back of the case with the panel off showing cable management

Next, mount the CPU water block to the motherboard, and be careful to not overtighten it.

Whatever GPU water block you purchase should come with instructions on removing the air cooler from your graphics card and installing the water block.

graphics card with thermal pads on but fan housing removed
graphics card with thermal pads removed

Once you've removed the air cooler and removed the original thermal pads, the instructions will tell you where to place the new thermal pads and how to install the water block.

graphics card with water block installed

The next step is to mount the radiator, fans, and reservoir inside the case.

Next, install the fittings where you will have tubing and caps on any ports where you will not. After that, mount the GPU inside your case. I used the riser cable for this step since I wanted a vertically mounted GPU.

With everything installed, I started running tubing inside the case, marking it, and cutting it for each run. If you are doing this alone, you may have already measured these lengths and cut them, so this step is not necessary and you can skip straight to attaching the tubes.

Leak Test

Before you do a leak test, you should place as many paper towels as you reasonably can under every set of fittings in your build. This will help catch any leaking water and you can easily touch test the paper towels throughout to ensure they stay dry.

To fill my loop, I used a kitchen funnel and a spare piece of tubing to fill the reservoir. Then (using a jumper on the power supply ATX 24-pin to run the pump), I slowly added the PrimoChill Vue System Prep mixed with distilled water, cycling the power supply to pull the water through the loop. Once the loop was full, I let it run for a few hours until I was satisfied there were no leaks. Below is a photo of my computer during the leak test.

Note: Do not run the pump with no water in the reservoir. This can and will burn out your pump very quickly

After the leak test, I removed the jumper and reconnected my components. I used the system normally for three days to let the system prep run while continuing to keep a close eye on it for any leaks.


To flush the loop, I unmounted the GPU from the case and drained it from the plug there into a bowl. Once the water level was sufficiently low, we picked up the case and tilted it around (very carefully) until any remaining fluid drained out. After that, I refilled it with distilled water and drained it again after running it for a few minutes with the jumper cable as described in the leak test section above.


Once the system was totally drained, I refilled it using the same process as described in the leak test section using my final fluid (PrimoChill Vue). I let it run normally for a few days to get rid of any air bubbles, then topped off the reservoir until it was as full as I could comfortably make it. Below are some photos of the completed build.


In the end, I'm incredibly pleased with how this build turned out. It's the first build I've ever done where it felt completed (at least for now). If I could do it over again, I definitely would have been more careful to not order a brand new case without waiting for reviews and build videos to go live. Water cooling is an expensive and complicated process, but now I have a computer I am truly proud that I built.