Question [Q] ZTE Balde 3 Ram

hey guys, I have a zte blade 3 and the specs say that it has 512mb of ram. But when i opened the task manager and saw the ram i just saw 391mb. I mean thats too less and at times my fone freezes. Is there any way to increase the internal ram?? it has CM10.2 installed currently and want to upgrade to CM11. But want to somehow increase the ram before doing that..

Any ideas?