adhar kaushal :
i have 3gb ram but in computer properties it showing only 2.75gb usable
adhar kaushal :
when i have 4gb than again they showing 2.75gb usable
Hi, that is very likely a problem with your BIOS. See if you have a BIOS update for your motherboard.
I had exactly the same problem on an ASUS motherboard and even though I had win 8 64 bit I could only see 2.75gb RAM.
I flashed the BIOS to the latest version and now I can see 8gigs.
Try going to your motherboard's manufacturers website and download the latest BIOS and follow instruction on how to update your BIOS.
Gabor