Thermal Grizzly Hydronaut
- Compound Type:
- Silicone-Based (silicone/metal-oxide)
- Thermal Conductivity:
- 7.8 W/mK
- Electrical Conductivity:
- Non-Conductive (pending verification
- Package Size:
- 3.9g / 7.8g tubes
- Recommended Use:
- Mainstream CPU/GPU
- Reapplication Interval:
- Verify manufacturer-rated interval
- Safety Notes:
- None
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Manufacturer: Thermal Grizzly Last updated: September 10, 2026
Thermal Grizzly Hydronaut (Silicone/Metal-Oxide Based/Non-Conductive/7.8 W/mK/Built for Large Cooling Surfaces) Review
Hydronaut fills a specific niche in Thermal Grizzly's lineup: a paste built for large cooling surfaces, explicitly marketed by the brand for use on consoles like PS4, PS5, and Xbox alongside standard desktop CPUs and GPUs. At 7.8 W/mK, it trails Kryonaut but competes with Arctic's MX line on straightforward mainstream performance.
Hydronaut fills a specific niche in Thermal Grizzly's lineup: a paste built for large cooling surfaces, explicitly marketed by the brand for use on consoles like PS4, PS5, and Xbox alongside standard desktop CPUs and GPUs. At 7.8 W/mK, it trails Kryonaut but competes with Arctic's MX line on straightforward mainstream performance.
Thermal Performance and Conductivity
Rated at 7.8 W/mK, Hydronaut sits just below Arctic MX-4 and MX-6's 8.5 W/mK, placing it in the same mainstream bracket rather than competing with Kryonaut or TFX on raw conductivity.
Compound Type and Composition
A silicone and metal-oxide based compound, consistent with Thermal Grizzly's non-liquid-metal lineup, formulated for even spreading across larger surface areas than a typical desktop CPU integrated heat spreader.
Application and Consistency
Thermal Grizzly markets Hydronaut specifically for large cooling surfaces, and its consistency is built to spread evenly across console APUs and other larger dies without requiring the more careful, small-area application liquid metal demands.
Electrical Safety
Listed as non-conductive, though some retail listings describe it generically as a "conductive thermal paste," referring to thermal conductivity rather than electrical. This distinction should be confirmed against Thermal Grizzly's own documentation before publishing.
Longevity and Pump-Out Resistance
Manufacturer-rated interval isn't as prominently published as Arctic's MX-6 claims. Confirm against current Thermal Grizzly documentation before publishing a specific timeframe.
Comparison to Sibling Products
Against Thermal Grizzly's own Kryonaut, covered elsewhere on this site, Kryonaut rates higher on conductivity and targets high-end desktop builds, while Hydronaut targets larger surfaces including console hardware. Against Arctic MX-4, Hydronaut offers a similar mainstream conductivity bracket with a specific use case advantage for large-die applications.
Who This Paste Is Actually For
Console CPU/GPU repasting (PS4, PS5, Xbox) where Thermal Grizzly specifically markets Hydronaut's large-surface application.
Mainstream desktop builds needing a straightforward, non-liquid-metal paste.
Not for: High-end desktop CPUs where Kryonaut's higher rated conductivity delivers more headroom.
Not for: Builders who need a definitive electrical conductivity answer without confirming against current documentation first.
Pending Verification
Electrical Conductivity: Some listings label it generically as "conductive" (thermally, not electrically); confirm non-conductive.
Reapplication Interval: Manufacturer-rated interval not consistently published.
Specifications
Identity and form
| Brand | Thermal Grizzly |
|---|---|
| Model | Thermal Grizzly Hydronaut , Hydronaut |
Application
| Applicator Included | Spatula |
|---|
| Compound Type | Silicone-Based (silicone/metal-oxide) |
|---|---|
| Thermal Conductivity | 7.8 W/mK |
| Electrical Conductivity | Insulating |
| Package Size | 3.9g / 7.8g tubes |
| Recommended Use | 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 |
| Safety Notes | None |
| Paste Segment | Standard Paste |
| Curing | Non-Curing |
Expert Review
Reviewed by Burooj Alam. Rated by us, not by users.
Best for
- Console CPU/GPU repasting (PS4, PS5, Xbox) where Thermal Grizzly specifically markets Hydronaut's large-surface application.
- Mainstream desktop builds needing a straightforward, non-liquid-metal paste.
Not for
- High-end desktop CPUs where Kryonaut's higher rated conductivity delivers more headroom.
- Builders who need a definitive electrical conductivity answer without confirming against current documentation first.
FAQs
What are the key specifications of the Thermal Grizzly Hydronaut (Silicone/Metal-Oxide Based/Non-Conductive/7.8 W/mK/Built for Large Cooling Surfaces)?
The Thermal Grizzly Hydronaut (Silicone/Metal-Oxide Based/Non-Conductive/7.8 W/mK/Built for Large Cooling Surfaces) is a thermal paste from Thermal Grizzly. Key specs: Compound Type Silicone-Based (silicone/metal-oxide), Thermal Conductivity 7.8, Electrical Conductivity Non-Conductive (pending verification; some listings say "conductive" meaning thermally, not electrically), Package Size 3.9g / 7.8g tubes, Recommended Use Mainstream CPU/GPU, High-end CPU/GPU (upper-mid builds; suited to large cooling surfaces such as PS4/PS5/Xbox).
Will the Thermal Grizzly Hydronaut (Silicone/Metal-Oxide Based/Non-Conductive/7.8 W/mK/Built for Large Cooling Surfaces) work with my current setup?
The Thermal Grizzly Hydronaut (Silicone/Metal-Oxide Based/Non-Conductive/7.8 W/mK/Built for Large Cooling Surfaces) lists Thermal Conductivity is 7.8. Check that against the hardware you already own before buying, since this is the field that most often decides whether a part fits.
Who is the Thermal Grizzly Hydronaut (Silicone/Metal-Oxide Based/Non-Conductive/7.8 W/mK/Built for Large Cooling Surfaces) best suited to?
It suits console cpu/gpu repasting (ps4, ps5, xbox) where thermal grizzly specifically markets hydronaut's large-surface application., mainstream desktop builds needing a straightforward, non-liquid-metal paste..
What are the drawbacks of the Thermal Grizzly Hydronaut (Silicone/Metal-Oxide Based/Non-Conductive/7.8 W/mK/Built for Large Cooling Surfaces)?
It is a poor fit for high-end desktop cpus where kryonaut's higher rated conductivity delivers more headroom., builders who need a definitive electrical conductivity answer without confirming against current documentation first..
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