so are you saying you are getting this issue 25% into model creation?
by that time all the gpu part is finished so you shouldn’t see it in use. (only used for depth maps).
are you running hard drive or ssd for temp?
it could be a ram issue. it probably wants a fair bit more with 1600 photos.
I think the last part of model creation is single threaded. but that shouldn’t be seen until 90%.
I’ve seen this plenty of times. just not at 25%, usually its 80-90% for me. but I’ve only been using it with either 64 or 128gb ram.
also check your alignment. if it is working on a part of the mesh thats not alignment properly it can cause these kinds of issues. can be also be solved by not reconnecting the problem area. though finding that bad part can be difficult.