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The memory error message come up when a given instance of ROM hit ~1.3 gig of memory usage. Not too long after that you crash.
If you go stand in your house for a while the last zone will eventually release from memory and you will not crash.
It has nothing to do with your pc's overall memory usage, only with a given instance of ROM's memory usage.
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Elldarian, Leadership Council Dovahkiin on Palenque Lvl 12 Guild
"Gentlemen, you can't fight in here. This is the War Room!"