Phobya Thermal Pad Ultra 5W/mK
- Thermal Conductivity:
- 5 W/mK
- Electrical Conductivity:
- Non-Conductive
- Recommended Use:
- Mainstream CPU/GPU
- Package Size:
- 15x15x4mm
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Manufacturer: Phobya Last updated: 2026-09-15
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Phobya Thermal Pad Ultra 5W/mK (Pad/Non-Conductive/15x15x4mm) Review
The Phobya Thermal Pad Ultra is Phobya's mid-conductivity thermal pad line, rated 5 W/mK and sold in many sizes for VRAM, VRM, and other board-level components that need a flexible cut-to-size pad rather than a paste.
Phobya officially rates the Thermal Pad Ultra line at 5 W/mK, and the pad is designed to be very soft and flexible so it adapts to height differences and surface irregularities at low contact pressure, unlike a stiffer standard pad. This 15x15x4mm piece can bridge gaps up to 4mm and compresses to roughly half its original thickness under mounting pressure, and the surface ships with a protective foil over a slightly sticky adhesive that keeps the pad from sliding once installed. It's electrically non-conductive, so it's safe for direct contact with VRAM and VRM circuitry. Against Phobya's own Thermal Pad XT also in this catalog, the Ultra line runs lower conductivity (5 vs 7 W/mK) but offers a thicker, more compressible option for bridging larger height differences.
Thermal Performance and Conductivity
Phobya officially rates the Thermal Pad Ultra line at 5 W/mK, below the company's newer Thermal Pad XT line (7 W/mK) also sold under the Phobya brand.
Composition
Phobya markets the Thermal Pad Ultra as a flexible, low-hardness pad material designed to equalize height differences on coolers and cooled surfaces.
Application and Consistency
This 15x15x4mm piece bridges gaps up to 4mm and compresses to about half its original thickness under mounting pressure; a protective foil covers the slightly sticky surface until installation.
Electrical Safety
The pad is electrically non-conductive, making it safe for direct contact with VRAM, VRM, and other exposed board circuitry.
Longevity and Pump-Out Resistance
As a solid pad rather than a spreadable paste, the Thermal Pad Ultra avoids liquid pump-out migration entirely, though Phobya does not publish a specific service-life figure.
Comparison to Sibling Products
Against Phobya's own Thermal Pad XT also in this catalog, the Ultra line runs lower conductivity (5 vs 7 W/mK) but is available in thicker options for bridging larger height differences on uneven mainboard components.
Specifications
Identity and form
| Brand | Phobya |
|---|---|
| Model | Phobya Thermal Pad Ultra 5W/mk |
Cure and durability
| Pump-Out Resistance | High |
|---|
| Thermal Conductivity | 5 W/mK |
|---|---|
| Electrical Conductivity | Insulating |
| Package Size | 15 x 15 x 4mm, sold as a single piece; also available in other sizes up to 120x20mm strips |
| Recommended Use | Mainstream CPU/GPU; Phobya also markets it for VRAM, VRM, and North/Southbridge cooling |
| Consistency | Very flexible, low-hardness pad that adapts to uneven surfaces at low contact pressure; compressible to half its original thickness; maximum bridgeable gap of 4mm; slightly sticky surface under a removable protective foil |
| Paste Segment | Pad |
| Spec Score | 5.8 |
Expert Review
Reviewed by Burooj Alam. Rated by us, not by users.
Best for
- VRAM, VRM, and mainboard chipset cooling needing a compressible pad to bridge height differences up to 4mm
- Builds where a stiffer paste application is impractical, such as tightly-toleranced GPU backplates
Not for
- CPU IHS-to-cooler contact where a conventional paste offers thinner bond lines
- Buyers wanting Phobya's higher-conductivity Thermal Pad XT line instead
FAQs
What are the key specifications of the Phobya Thermal Pad Ultra 5W/mK (Pad/Non-Conductive/15x15x4mm)?
The Phobya Thermal Pad Ultra 5W/mK (Pad/Non-Conductive/15x15x4mm) is a thermal paste from Phobya. Key specs: Form Pad, Thermal Conductivity 5, Electrical Conductivity Non-Conductive, Recommended Use Mainstream CPU/GPU; Phobya also markets it for VRAM, VRM, and North/Southbridge cooling, Package Size 15 x 15 x 4mm, sold as a single piece; also available in other sizes up to 120x20mm strips.
Will the Phobya Thermal Pad Ultra 5W/mK (Pad/Non-Conductive/15x15x4mm) work with my current setup?
The Phobya Thermal Pad Ultra 5W/mK (Pad/Non-Conductive/15x15x4mm) lists Thermal Conductivity is 5. 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 Phobya Thermal Pad Ultra 5W/mK (Pad/Non-Conductive/15x15x4mm) best suited to?
It suits vram, vrm, and mainboard chipset cooling needing a compressible pad to bridge height differences up to 4mm, builds where a stiffer paste application is impractical, such as tightly-toleranced gpu backplates.
What are the drawbacks of the Phobya Thermal Pad Ultra 5W/mK (Pad/Non-Conductive/15x15x4mm)?
It is a poor fit for cpu ihs-to-cooler contact where a conventional paste offers thinner bond lines, buyers wanting phobya's higher-conductivity thermal pad xt line instead.
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