I have tried several ENB presets and variations (113, 117), but it seems that with all of them I get random freezes - screen freezes game stops, sound countinues normally- ONLY in exterior cells.
Interiors never produce this, neither exteriors with enb turned OFF.

Is it possible that this is caused by hardware limitations, to be exact: lack of video memory?
I have a pretty old VGA - 4850 512 Mb ( no overclock). I know its not the best choice to run ENB, but with Occlusion and deatiled shadows turned off the game runs pretty decent (.113 almost no fps drop, .117 slower but its not optimised yet if im correct).

Any advice? (let me know if more info needed)

Many thanks in advance!