So I have an issue when skyrim tries to address more then 3GB of memory. The game will crash to CTD immediately. No errors or anything unusual in papyrus logs. I have verified that the executable is large address aware which to my knowledge means it should be able to use up to 4GB. But regardless of what I do once it hits 3GB it will CTD. I have swapped memory modules out since I have 4 8GB sticks to play with, ran memtest and it all passed. Skyrim Performance Monitor shows vram under the 3gb limit of the 580's in SLI that I have. System is Windows 7 64 bit with 32GB of ram. I can consistantly recreate the issue by zoning from a high pop grid like windhelm into a large interior space since the engine keeps the outdoor area cached and loads the internal area on top of it.