Introduction
When an off‑the‑shelf cooler can’t tame a $12,000, 96‑core Zen 5 monster, enthusiasts turn to extreme engineering. Chinese YouTube channel Geekerwan documented a complete DIY cooling loop for the Ryzen Threadripper Pro 9995WX, combining CNC‑machined parts, automotive‑grade pumps and a 37‑gallon industrial chiller.
Designing the Custom Integrated Heat Spreader (IHS)
Instead of delidding the expensive die, Geekerwan borrowed a stock IHS from an Asus prototype and used a series of sacrificial Threadripper 1900X chips to test micro‑channel depths.
- 1.5 mm cuts → 82.1 °C
- 2.0 mm cuts → 81.2 °C (optimal)
- 2.5 mm cuts → 80.4 °C (risked structural integrity)
The final design kept a 2.1 mm safety margin while providing the best thermal performance.
Microchannel Pattern Optimization
Straight channels are standard, but CFD simulations showed that wavy S‑shaped channels increase the heat‑transfer area by up to 20 %.
- Straight channels: baseline
- Wavy S‑channels: +1.2 °C lower temperature on the test chip
This modest gain was critical when scaling to the massive 9995WX die.
Four‑Tube Water Block Architecture
The Threadripper Pro’s two CCDs sit at opposite edges, so a conventional dual‑tube block would create uneven cooling. Geekerwan iterated from a three‑tube layout (central inlet, side outlets) to a cross‑pattern four‑tube design:
- Two central inlets positioned directly over each CCD
- Two side outlets for balanced flow
- Four‑tube layout delivered up to 5.1 °C lower temperatures versus dual‑tube blocks
The block houses one hundred custom fins of varying lengths, machined over 19 hours on a Taikan T‑700S CNC mill.
Cooling Loop Components
The loop combines automotive‑grade hardware with data‑center‑level cooling:
- Two 50 W Bosch water pumps (one salvaged from a Mercedes, one from a Geely)
- Industrial chiller set to 0 °C
- 37‑gallon insulated reservoir
- Custom CNC‑machined IHS and water block
Ice‑cold water circulates through the CPU block, GPU heat‑pipes and a massive radiator array, keeping the liquid temperature around 2 °C.
Overclocking Results
With the loop operational, Geekerwan pushed the 9995WX to 5.325 GHz (≈176 W TDP at idle, ~1,340 W under load). Key metrics:
- Cinebench R23 multi‑core score + 18 % over stock PBO (≈4.8 GHz)
- Core temperatures 30 °C – 50 °C during Cinebench 2024/2026 runs
- System power draw ~1,700 W
The overclock placed the chip 7th on HWBot’s global leaderboard, just behind a 6.2 GHz Threadripper Pro 7995WX cooled with liquid nitrogen.
Performance Summary
The combination of a deeper, wavy‑channel IHS, a four‑tube water block and an industrial‑grade chiller created a cooling solution capable of extracting >1 kW of heat while maintaining safe silicon temperatures. This demonstrates that, with enough engineering effort, even the most power‑hungry desktop CPUs can be run far beyond their stock limits.
Conclusion
Geekerwan’s project showcases the extremes of DIY cooling: meticulous simulation, costly CNC machining, repurposed automotive pumps and a massive chilled reservoir. For builders chasing the absolute performance ceiling of AMD’s flagship Threadripper Pro, the article provides a step‑by‑step blueprint and realistic expectations of cost, complexity and results.