Custom Water Cooling Build Log – RTX 4090

After weeks of planning, I finally completed a custom loop for my RTX 4090. Below are the components, the build process, and performance results.

Components

• EVGA RTX 4090 FTW3 Ultra
• EK-Quantum Vector² RTX 4090 D-RGB Water Block
• EK-Quantum Velocity² D5 Pump/Reservoir Combo
• XR-5 4‑inch Radiators (2x)
• EK‑Quantum Torque STC‑T 6‑Pin PCIe Power Connectors
• Corsair Hydro X Series 50 mm Sleeved Hard Tubing
• Coolant: EK‑CryoFuel (Black)

Installation Steps

1. Removed stock cooler and installed the EK water block.
2. Mounted the pump/reservoir combo at the bottom of the case.
3. Routed tubing using zip ties for a clean look.
4. Mounted the radiators on the top and front of the case.
5. Filled the loop, bled air, and tested for leaks.
6. Performed a stress test with 3DMark Time Spy.

Results

Idle temperature: 28 °C

Load temperature: 55 °C

Average power draw: 380 W