i want to play games but my onboard graphic memory is 512 i need to increase it by ram memory
my processor is intel core2 duo cpu e7200 @ 2.53GHz
Figured it was for games hich is why I wanted you to clarify. Increasing the RAM won't do you any good, the issue is the poor capability of most onboard video chipsets. You are asking the wrong question, the question should be "I want to play games on my computer, what do I need?"
You need to get a video card. For a basic system with about a 280-300 watt power supply, nVidia GT 740 64bit GDDR5, GT 630, AMD R240, AMD 7750. Onboard video will not be able to handle any newer game.