Did it, but encountered new problem (not quite sure if it really new, because i returned to the game after a few month break, and it looks like, i v taken it just because i had this error before): for some reason game CDT during saving. Sometimes it saves well. But sometimes it starts saving, then all sounds disappear and it shows me a message that java ceases to function.
Not sure that it is connected with memory allocation changes, because i saved backup file before modifyng anything.
I m using Win7 64x. Have 16gb ram, but my frind said, that only 8 of them are in use because of some build restrictions (something with motherboard, i guess... we talked about that like 5 years ago, cant remember all the details). So, i v allocated 4gb. Also, using geforce 660TI (it says: 2 gb vram).
CDT happens in the same system: i v destroyed AI nexus, saved (success), then trying to fly and take control over sensor array, encountering 2 AI fleets, destroying the biggest, saving (crush here). Trying to reload and save before the battle just to check if it works - still crush. Never tried to leave the system yet.
Will try to update the mods later. If it will not help, will have to start new game, i guess... This one was really overloaded: used a lot of factions, big sector size and also set maximum density (up to 6 colonies per system + few stations). The strange thing is: i had memory leak problem, but never (may be few times) encountered any crashes, so, i guess, it is some problem with current sector developed after some time.