Thanks for the quick response JCL. This makes sense, and I had a feeling I was pushing the limits due to lightmap model duplicates, although I have a few more questions.

Why doesn't the memory consumed by entities, sounds, bmaps, ect. in the statics panel add up to what it is showing for the nexus and sys_memory variables? When added up it is less than half of the sys_memory.

Why does it show over 700MB of memory as still being available in the stats panel when the error occurs?

Is there a statistic showing the amount of physical memory(RAM) the game is using, if not, could there be one?

What is the graphics card memory(512MB) used for?