I believe it needs a minimum of 2 cores itself (main thread and render thread) and probably 1 more (DX11 thread) for a total of 3.
Update: just tested
8C8T:
3C3T:
With 2C2T it locks up, enabling 3C3T it resumes.
Update: a quick flight over photogrammetry (LAX) and it is better with 8C8T than 4C4T on my system.