The math if available RAM memory

Your onboard graphics take memory from your system memory. Usually you can go into the bios and change how much video memory the onboard chip can use. If your onboard graphics has a max memory usage of 512mb then that reduces your available system memory by 512mb. Not that hard to figure out.
 
Let the graphic memory used be 1.5GB, and the total RAM installed is 4GB.
Then the available physical memory is 2.5GB(4-1.5).....correct me if i am wrong.

If I have a dedicated graphic memory of 1GB does the available physical memory become 3.5GB?
3.5 = 4 - 1.5 + 1
 
If you have a dedicated video card then no, it doesn't take any memory away from the system. However, If your operating system is only 32 bit or sometimes even 64bit, there are certain limitations. 32 bit OS's will usually only see anywhere from 3.25-3.5 gb of ram as it can't utilize anything over 4gb and there are certain hardware addresses that will use that up.
 
What if the graphic memory used is more than that provided by video card.
There are laptops with dedicated graphic memory of 512MB.
 
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The system won't use more graphic memory then what it has. If the app or game requires more memory then what it has then it won't run very well.

Can I ask why you are asking these questions? Do you have a memory issue?
 
Multitasking(not CPU intense), watch HD movies, play some mid range graphic games (Driver: San Francisco).

Are you having any suggestion??
 
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