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Hey folks,

I’m in the middle of building a custom immersion-cooled GPU workstation designed for AI/ML dev, rendering, and simulation workloads. The whole system is built around performance and thermal efficiency — and yes, it’s going full immersion in dielectric coolant.

 

Build Highlights:

Dual RTX 5090s

Threadripper Pro CPU

ECC memory (256GB)

Custom acrylic immersion tank (in fabrication)

External loop: pump → 1080mm radiator → 9× industrial-grade fans → return

Two PSUs: 1 for compute, 1 for the cooling system

 

The goal is to run long sessions (model training, rendering, etc.) without thermal throttling or fan noise. I’m handling the tank and loop build myself.

 

Would love suggestions/feedback on:

Best practices for immersion loop layout and flow direction

Dielectric coolant handling (using Thermasolv CF2)

Power management for two PSUs

Cable routing inside an open/immersive layout

Fan control without motherboard PWM headers (using Phanteks fan hub)

 

Anyone else playing with immersion setups or non-traditional cooling? I’d love to learn from your setups or get input before I finish assembly.

Thanks in advance!

WhatsApp Image 2025-06-19 at 19.15.44.jpeg

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