I know this ain't directly a mod problem (but then the usage is due to mods so kinda is) so hopefully this wont get moved. I posted in someone's thread in the hardware forums but trying to get an answer over there is like trying to get blood out of a stone so hopefully I'll be more successful here.

I'll C&P what I posted there.

Can some tell me what might be the problem I'm having, it's happened quite a new times now, every time Skyrim reaches around the 2gb mark just under or just over the came seems to freeze, it happened just now hence the reason I'm posting. Could be coincidence but that would be a lot of coincidences...so can anyone shed some light of what might be happening.

Specs
EDIT:

Just happened again at 2146mb usage.

That's what I posted and again it happened just before creating this thread, exiting Warmaidens it just got stuck on the loading screen, usage was at 2155mb and I'm using Skyrim Performance Monitor to keep track on what's happening.

Any clues?