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This is quite common to have 64GB memory now, and even 128. There is no reason to add any artificial caps on the cache and undo memory here. We can not protect against using too much memory in one cases and allow use of full computer potential in others. Now 32 bit will use 2GB max (as it used to be), but 64bit will use whatever number of megabytes fits into integer. Reviewers: campbellbarton, mont29 Subscribers: sebastian_k Differential Revision: https://developer.blender.org/D2972