If you want to know the specs of your integrated graphics you can download GPU-Z. It will tell you all you want to know about your R7 integrated graphics and every dedicated graphics card you add to your system in the future.
The A8-7500 is what AMD calls an APU, a CPU + GPU in a single chip. It uses your system's RAM as video memory. Additionally, your RAM frequency also affects how your integrated graphics perform, meaning that if you add a RAM stick with higher frequency, you will also be boosting R7's performance too.