Factory Thermal Paste Problems on New Antminer Z15 Hashboards
By Aleksandr (Alex) MuranovBrand New Z15 Hashboards… With Bad Thermal Paste Application
We recently inspected several brand new Antminer Z15 hashboards and found surprisingly poor factory thermal paste application on the ASIC chips.
The contact pattern showed:
- Uneven thermal paste coverage
- Visible air gaps and bubbles
- Dry contact zones
- Excess overflow around the chip edges
On high-power ASIC miners running 24/7, thermal interface quality directly affects chip temperature balance, hotspot formation, long-term reliability, and overall miner stability.
Why Thermal Paste Quality Matters on ASIC Miners
ASIC chips operate under continuous heavy thermal load. Even small imperfections in thermal contact between the chip and heatsink can create localized hotspots.
Over time, poor thermal transfer may contribute to:
- Chip overheating
- Hashrate instability
- Increased hardware stress
- Early ASIC degradation or failure
Many miners assume factory-applied thermal paste is always properly distributed. In practice, we regularly see inconsistent application patterns, even on newer hardware.
Heatsink Contact Pattern Inspection
After separating the heatsink from the ASIC package, the thermal transfer pattern clearly showed incomplete contact areas.
Should You Re-Paste a New Z15?
If you operate Z15 miners long-term, especially in hot environments or heavily loaded farms, inspecting and replacing the factory thermal interface material may be worthwhile.
For rework and preventive maintenance, we typically use high-performance thermal compounds such as Arctic MX-6 to improve thermal consistency and long-term contact reliability.
Proper thermal paste application helps improve thermal consistency across chips and may reduce long-term stress on the hardware.
This is especially important for older miners, refurbished units, or machines with unknown maintenance history.
Video: Z15 Thermal Paste Replacement Process
Below is a real example of thermal paste replacement work on Antminer Z15 hashboards. Proper surface preparation, thermal compound application, and heatsink contact quality all play an important role in long-term ASIC reliability.
On older Z15 miners, dried or uneven thermal interface material is one of the most common contributors to overheating and unstable operation.
Final Thoughts
Factory quality control on ASIC thermal interfaces is not always perfect, even on new hardware.
If your miner shows unusual temperatures, unstable behavior, or overheating symptoms, thermal interface inspection should be part of the diagnostic process.