Thermal Grizzly has released the PhaseSheet PTM Pro, a phase-changing thermal pad the company says offers improved thermal conductivity over the original and is easier to install. The pad is aimed at PC builders and component users who want consistent cooling without the upkeep that traditional thermal paste can require.
Like the original PhaseSheet PTM, the Pro version relies on a material that changes its physical properties with temperature. It stays solid at room temperature, functioning much like a conventional thermal pad. Once temperatures rise above 45 C, the material turns into a very low-viscosity liquid that behaves similarly to thermal paste.
That phase change is intended to reduce the pump-out effect common with traditional thermal paste. Pump-out occurs when paste gradually migrates out from between a heatsink and a GPU die or CPU IHS as the contacting surfaces repeatedly expand and contract. Over time, this can shrink the amount of paste covering the contact area and potentially degrade cooling performance.
Thermal Grizzly says the PhaseSheet PTM Pro is reusable and electrically non-conductive, so it can be used safely on components without an IHS. That includes mobile CPUs, GPUs, and other internal components such as memory and storage.
The company shared a performance graph showing the new pad beating several popular thermal pastes and pads in controlled testing. With a 30 x 30mm contact area, 300N of mounting force (48 PSI), and a 240W heat load, the PhaseSheet PTM Pro recorded a temperature difference of 5.83 C, the lowest among all materials tested. It finished ahead of the KryoSheet at 6.13 C, the Duronaut Pro at 6.29 C, and the original PhaseSheet PTM at 6.36 C.
The PhaseSheet PTM Pro is available through Thermal Grizzly's website at $23.28 per 40 x 40mm sheet. That is considerably more than the original PhaseSheet PTM, which costs $13.92 for a larger 50 x 40mm sheet.
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