There is no GDDR on the card , since it's a onboard graphics chip (Integrated GPU)
What will happen is that the BIOS will set the amount of Memory to be shared with this Chip.
Thus, there is as such, no dedicated GB of RAM, as you have put it.
It is not capable of Gaming, although it may run some preliminary games at their lowest resolutions.
It is NOT a Graphics CARD...... It is just a integrated chip on the Mobo , capable of doing the minimum of Graphic renderings for office and home stuff.