Threadripper Pro 9995WX reached 5.3 GHz without nitrogen: we replaced the cap with a water block, connected a chiller and 140 liters of water.

The Chinese YouTube channel Geekerwan tested the 96‑core AMD Ryzen Threadripper Pro 9995WX processor

The host of the Geekerwan channel built a custom liquid cooling system and ran it on the flagship workstation chip AMD Ryzen Threadripper Pro 9995WX, which costs almost $12,000. The system includes:

* an integrated heat spreader (IHS) machined on a CNC machine;
* automotive‑grade cooling components;
* an industrial chiller;
* a 140‑liter reservoir.

Why it matters
* Ryzen Threadripper Pro 9995WX is a Zen‑5 processor designed for professional workstations. It’s two to three times larger than typical consumer chips and uses a complex “chiplet” architecture, making cooling especially critical.
* IHS modifications have been seen on the Core i9‑14900KS, but Threadripper 9995WX requires a special approach.

Project preparation
1. Testing on older models
The team used several Ryzen Threadripper 1900X chips to design and test various microchannel layouts.

2. Determining groove depth
* The IHS of the Threadripper 9995WX is thicker (0.6 mm) than that of the 1900X, so the microchannels had to be made slightly deeper.
* Grooves were tested at 1.5 mm, 2.0 mm and 2.5 mm: temperatures were 82.1 °C, 81.2 °C and 80.4 °C respectively.
* A depth of 2.0 mm was chosen (leaving ≥ 2.1 mm of heat‑dissipating surface) to avoid compromising structural integrity.

3. Selecting the microchannel layout
* Standard straight channels were replaced with wavy S‑shaped channels.
* Modeling showed a ~20 % increase in heat transfer area.
* On the 1900X, this design lowered temperature by 1.2 °C compared to straight channels.

4. Production
* The Taikan T‑700S machine ran for 19 hours and used 14 fragile 0.3 mm‑thick milling bits.
* The final IHS is an array of a hundred ribs of varying lengths on a board costing $12,000.

Final assembly
* Automotive components were used for cooling, providing higher flow rate and pressure than standard coolers.
* An industrial chiller and reservoir are included to maintain stable temperature under heavy load.

Results
Geekerwan demonstrated how to combine a complex hardware solution (the 96‑core Threadripper Pro 9995WX) with a high‑tech liquid cooling system. The results show that a properly designed IHS and wavy microchannels can significantly improve thermal efficiency even on the most powerful workstations.