The 13mm / half inch Define R5

  1. Home
  2. /
  3. Builds
  4. /
  5. Build
Member since
Build Views
Build Approvals

The 13mm / half inch Define R5

I want to publish this build mainly because it uses 13mm / half inch hard tubes in a Fractal Design Define R5 case. Most builds on the Internet are either with 16mm tubes or do not specify the tube size. When I was deciding which tubes to go with, it would have been nice to see some examples of 13mm tubes in a Define R5.

The main reason for going with 13mm tubes for me was that this was a conversion from soft tubes to hard tubes, so I already owned the radiators. Unfortunately these Alphacool V1 radiators did not have enough space for 16mm fittings when a fan was installed on the same side as the fittings (this was discussed at

What went well:

  • the machine is inaudible when idling - to keep the water from making a splashing noise (especially in the Monsta radiator), I filled the loop to the top
  • it does not look too shabby (the colours in the photos look very different in real life)
  • combining the two above: the Noctua fans are very good, even though they don't match the color scheme (not going to replace them with the black variants only due to cosmetic issues - I did buy the black accents though [and spray painted a couple brown ones])
  • the Define R5 case is of the correct size for a build like this - anything smaller would be too small. The HDD cage has been removed (not by force, the case is modular)
  • the EK CryoFuel Navy looks very good and if it leaks, you'll see the dried blue leak marks notifying you where the leak originated (the glass is always half full Emoji)

Even better if:

  • the Alphacool NexXxoS Monsta 120mm radiator is not the best product I've ever bought, should have gone with the 30mm or 45mm thick variant. It makes noise if not filled to the top and I'm not too sure about the performance gains either. On the bonus side, it does have a fill port on the top, which is very useful
  • the Barrow ball valve could be of a better quality: it is very stiff and it is not flat in the inside (creates some resistance in the flow)
  • behind the reservoir there is an EK Quantum Torque Drain Valve from 2022 and it has started leaking. The cap does not have an o-ring, so I replaced that with a regular G 1/4 inch plug with an o-ring
  • this was my first hard tube build and coming from soft tube builds, I was accustomed to the compression fittings being very pull resistant. However these Alphacool Hardtube compression fittings do not hold the tube in place with great force - it is easy to pull the tube out even without unscrewing the fastening part of the fitting first. This is an issue only with the tube going from the GPU to the ball valve, as that tube could be accidentally hit and it might come off. I might replace the fittings in that tube with Alphacool Eiszapfen PRO fittings to try if those hold the tube in better (just to note that the PRO fittings are too large in diameter to be used with these radiators)
  • the AMD Ryzen 5900X is too powerful for my use cases - could have gone even with a 5600X with lower heat output (to lower noise), but at least this is a more "futureproof" machine if that is even possible. I'm running the 5900X in 65W eco-mode for now (just to note that most parts were bought in 2021, including the CPU)
  • the exposed Samsung SSD runs hot when in heavy use - will add an after market heatsink on top of that at some point


  • the Barrow ball valve is for calibrating the virtual flow sensor in the Aquacomputer D5 Next pump
  • there is a serial port on top of the PSU - good for configuring Cisco network devices, for example
  • similarly there is a floppy drive with internal USB adapter, spray painted black
  • the device next to the floppy drive is an ESP8266 module with a relay used to remote control the power of the machine. WOL isn't quite working for me, and with this module it is possible to send shutdown as well as hard shutdown signals (long power button press). Parsec is then used for 3D accelerated remote desktop
Color(s): Black Blue
RGB Lighting? Yes
Theme: none
Cooling: Custom Liquid Cooling
Size: ATX
Type: General Build


$ 277.97
AMD - Ryzen 9 (5900x)
Socket: AM4
Cores: 12
$ 183.92
ASUS - TUF Gaming Pro (WiFi)
Chipset: X570
CPU Socket: AM4
Size: ATX
$ 179.98
G.Skill - Trident Z Neo (3600MHz) (White/Black/RGB) (2x)
Type: DDR4
Capacity: 32 GB
$ 300.00
ASUS - GeForce Dual (EVO v2)
Chip Manufacturer: NVIDIA
Chip: RTX 2070
Interface: PCIe x16
$ 89.99
Samsung - 970 EVO 500 GB M.2 NVMe SSD
Form Factor: M.2
Interface: M.2 (M)
Capacity: 500 GB
$ 119.99
Western Digital - WD Black SN850
Form Factor: M.2
Interface: PCIe x4
Capacity: 1 TB
$ 100.00
Seasonic - SS-660XP2 (discontinued)
Wattage: 660
Form Factor: ATX
Efficiency: 80+ Platinum
$ 100.00
Fractal Design - Define R5 (Blackout)
Type: Mid-Tower
Side Panel: Window
Case Fan
$ 222.68
Corsair - ML140 (2x)
Size: 120 mm
Case Fan
$ 23.33
Delta - AFB1212VHE
Size: 120 mm
Case Fan
$ 98.85
Noctua - NF-A12x25 PWM (3x)
Size: 120 mm
Case Fan
$ 21.95
Noctua - NF-S12A PWM (Brown)
Size: 120 mm
$ 109.56
Alphacool - Eisbecher D5
Type: Reservoir
$ 77.45
Alphacool - NexXxoS Monsta
Type: Custom Loop
Size (WxHxD): 120 mm
$ 55.40
Alphacool - NexXxoS ST30 Full Copper
Type: Custom Loop
Size (WxHxD): 240 mm (2 x 120 mm)
$ 79.94
Alphacool - Nexxxos XP3 Light Brass
Type: Waterblock
$ 165.70
Aquacomputer - D5 NEXT
Type: Pump
$ 10.00
$ 26.96
Approved by: