Building a new PC - GPU helps?

[douga]

If you plan on using the GPU for AI motion detection, then look into getting a Google Coral Tensor Processing Unit (TPU) instead. It is inexpensive, is better than a high end GPU at AI motion detection, and uses 2 to 4 watts of total power doing so.

If this is accurate (no reason to doubt), it would be one of the most valuable nuggets of insight I have seen posted here.

I've been using my Coral TPU with Blue Iris for a few months now. It has been working great. A little blurb from Google on it's performance:

Performs high-speed ML inferencinglink
The on-board Edge TPU coprocessor is capable of performing 4 trillion operations (tera-operations) per second (TOPS), using 0.5 watts for each TOPS (2 TOPS per watt). For example, it can execute state-of-the-art mobile vision models such as MobileNet v2 at 400 FPS, in a power efficient manner