As I understand things, if you're using GPU rendering it is dependent on VRAM, and if you're using more than one GPU the VRAM available is whatever is on the largest card only. If you exceed that memory the render will immediately fail. The log will give stats on timing and memory usage. It's up to the user to manage the scene - if the scene is too large, switch to CPU or do things like reducing texture size, replace maps with procedurals etc to optimise it.

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