Will a DDR2 Graphics Card work on my DDR3 Motherboard?

Solution
Yes it will, GPU memory is dedicated to the GPU so there's no need to accomplish any "compatibility" between DDR of the card and DDR of the mobo, just be sure to have the proper socket to install the card.
Yes it will, GPU memory is dedicated to the GPU so there's no need to accomplish any "compatibility" between DDR of the card and DDR of the mobo, just be sure to have the proper socket to install the card.
 
Solution