Gmod crashing with 'poster' command

I’m working on a big artwork in Garry’smod and I’m HEAVILY relying on the poster command. I’m capturing lot’s of props in a single scene with just one light source per picture. Anywhere near poster 7 and Gmod immediately crashes with no report or anything.

I’m thinking this may be a RAM thing, but I can’t tell. Is there any way to allocate more RAM to Gmod so it can handle higher memory usage without failing?

Same here. Crashes on poster 4 (1-3 are fine). First crash is on the house - only Gmod.
Peculiar continuation: on second attempt, full system hangs, all screens turn black and only reset saves the day.

Was able to take poster 4 once earlier today, trying to pinpoint what causes the crash.