OK, I created such a ini file with 1000M (tried 1200M, but SH3D doesn't start anymore) and SH3D uses 0,5-0,6 GB of 0,9 GB - red squares Is 900 MB the maximum?

My PC is a HP spectre with 16 GB RAM and two 4k Monitors (1 generic, 1 via DisplayLink) @Win10 64bit