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Alphacool Subzero vs Thermal Grizzly Hydronaut: Comparison
Alphacool Subzero and Thermal Grizzly Hydronaut separate most on thermal conductivity: Alphacool Subzero at 16 W/mK, Thermal Grizzly Hydronaut at 7.8 W/mK, 51% in favour of Alphacool Subzero. They match on 4 other specifications, including electrical conductivity, reapplication interval and safety notes.
Specs
| Specification | ![]() | ![]() |
|---|---|---|
| Compound Type | High-Performance Silicone-Based | Silicone-Based (silicone/metal-oxide) |
| Brand | Alphacool | Thermal Grizzly |
| Model | Alphacool Subzero , Subzero | Thermal Grizzly Hydronaut , Hydronaut |
| Thermal Conductivity | 16 W/mK | 7.8 W/mK-51% |
| Electrical Conductivity | Insulating | Insulating |
| Package Size | 1g / 3.5g / 20g tubes | 3.9g / 7.8g tubes |
| Recommended Use | High-end CPU/GPU (including overclocking) | Mainstream CPU/GPU, High-end CPU/GPU (upper-mid builds; suited to large cooling surfaces such as PS4/PS5/Xbox) |
| Reapplication Interval | Verify manufacturer-rated interval | Verify manufacturer-rated interval |
| Safety Notes | None | None |
| Paste Segment | Standard Paste | Standard Paste |




