Why is that i have different ram size indicated on my system properties and bios setup?
This is perfectly normal behavior, especially on laptops, and occurs because your laptop is using SHARED MEMORY. When you use a laptop (and lower-end desktops), there is no memory set aside specifically for your graphics card like there is in desktops with stand-alone graphics adapters. The system simply has one bank of memory, and everything that requires memory will use that common bank… hence the term ‘shared memory.’ In order for your computer to display images, a certain amount of memory must be allocated to the on-board graphics chip. This memory is taken from your common pool of 512MB. Doing the math (512MB – 384MB), we see that your on-board graphics chip is allocating 128MB to itself. Your BIOS is hardware related… it reports the total amount of RAM installed on your system. System Properties is software related… it reports the total amount of RAM available to Windows. Since your graphics card allocates its portion of memory in hardware, long before Windows boots, Window
