If you’re upgrading to a dual, you may want to consider a heat sink on your Dual + Adapter. I overheated it pretty fast and eventually ended up with one of these:
And you’d need one of these too, cut to fit the chips:
And drilled out some holes in the heat sink and mashed in some M2.2x8 screws. Don’t tighten too hard or the boards will bend.
As far as I know, this is the only adapter that works with the Dual TPU. The problem is that the Dual TPU isn’t a 2x PCIe card, but its are two 1x interfaces over a single connection, which is something less supported. This adapter is more expensive, but is more compatible by converting it to a single 1x PCIe connection.
Dual Edge TPU Adapter is designed for Coral m.2 Accelerator with Dual Edge TPU to be used on a system with PCIe x1 slot available.
www.makerfabs.com
Maybe someday the guy will finish his 2x card / 4x PCIe lane adapter:
Dual Edge TPU Adapter to use it on a system with single PCIe port on m.2 A/B/E/M slot - magic-blue-smoke/Dual-Edge-TPU-Adapter
github.com
For thermal details, see the spec: