> Nvidia Orin will use significantly less energy though.
Not really.
A Ryzen 7 7840U has a GPU with 768 FP32 ALUs @ 2.7 GHz and a NPU that can do 10 TOPS and it has a default TDP of 28 W.
The top Jetson AGX Orin models consume up to 60 W or 75 W, but they are so expensive that it does not make sense to compare them with a computer with 7840U and 32 GB of LPDDR5x-7500 that costs 3 times less.
A comparison that makes more sense is with a Jetson Orin NX 16GB (still significantly more expensive), which has a GPU with 1024 FP32 ALUs @ 0.918 GHz and it has a default TDP of 25 W.
For graphics tasks, Jetson Orin NX would be several times slower than an AMD Phoenix, due to its low GPU clock frequency and much slower CPU cores. The same is true for any programs executed on the CPU cores.
On the other hand, for AI inference, Jetson Orin has very fast tensor cores, so it can be many times faster than an AMD GPU or an ARM GPU, i.e. Jetson Orin NX 16 GB is claimed to be able to do 100 TOPS, so if this is the main intended application it can be worthwhile. Nevertheless, the usefulness of the Jetson Orin models for AI inference is diminished by the fact that their price increases very steeply when more memory is desired.
> Any small computer with AMD Phoenix offers a much better GPU performance per dollar than any NVIDIA Orin.
> The use of NVIDIA Orin is justified only when one needs a device that is qualified for an automotive environment.
Nvidia Orin will use significantly less energy though.