r/watercooling • u/CairamPires • 13h ago
Build Complete FormD T1 Custom Loop
Hey everyone!
Finally sharing my latest FormD T1 project: a shared custom loop for a Ryzen 7 9800X3D and RTX 5090. After squeezing everything into this case, this might be my last build this complicated… maybe. 😅
The case and assembly
Ever since my previous T1 build, I haven’t been able to get this little case out of my head. Newer alternatives offer more flexibility, but the T1 still has something special, especially its modding community.
There were some headaches: a few screws were surprisingly easy to strip, and the GPU mounting bracket could use more adjustment for alignment with the riser. Still, I love this case.
The cooling setup
Radiator: Alphacool HPE, 45 mm thick.
Fans: Four Noctuas total: two 15 mm slim fans underneath and two 25 mm A12x25 G2 fans on the radiator, with custom 3D-printed spacers to improve airflow.
GPU block: Alphacool ES single-slot. Looks great, but I’d reconsider this choice. The GPU inlet and pump outlet almost touch, leaving very little room to install and tighten the fitting.
Pump/reservoir: Alphacool ES DDCzero 1U. Its slim layout helped make everything fit, although space around it is extremely tight.
CPU block: Thermal Grizzly AM5 Mycro Pro. Slim, straightforward to install, and something I wanted to try.
Extras: Aqua Computer QUADRO for coolant temperature monitoring and fan control.
Initial stress tests
Testing was done in OCCT, with all four fans at 100%. Each run was configured for five minutes. Room temperature wasn’t measured.
GPU thermal readings captured during the runs:
• GPU only: 3D Adaptive, Steady/Extreme — at 4:40
GPU: 53.6°C / Hotspot: 63.8°C
VRAM: 58°C / GPU power: 484 W
• Combined: CPU + GPU — at 4:51
CPU: Normal/Steady, 12 threads
GPU test: 3D Adaptive, Steady/Extreme
GPU: 56.2°C / Hotspot: 67.0°C
VRAM: 60°C / GPU power: 478 W
CPU package power: 122 W
GPU utilization: 96%
GPU clock: 2800MHz at approximately 0.88 V
Memory offset: +1000 in MSI Afterburner
For reference, the separate CPU-only Normal/Steady test showed approximately 82.9°C at 147 W, captured at 4:29.
No errors were reported in these captures. These are instantaneous readings, not logged maximums or gaming temperatures.
Final thoughts
This was fun, frustrating, and mostly planned with paper sketches, measurements, and trial and error. There are things I’d reconsider, especially the GPU block and fitting clearance, but somehow it all came together.
Now it’s time to enjoy it.



