Four chips can be installed on a single accelerator card, in a form factor similar to a GPU.
That sounds like a lot of horsepower, but who is it geared toward?
InspireSemi says their product addresses several critical areas of HPC workloads.

This means existing HPC workloads running on CPUs should have little to no custom code to run in Thunderbird.
Thunderbird means to inherit the power efficiency of the RISC-based architecture.
InspireSemi claims a 30-60% power efficiency compared to similarly capable solutions.
One metric is up to 24 FP64 TFLOPS at 50 GFLOPS/W (480W).
The speed at which companies are utilizing open-source solutions is remarkable.