Hi alejo0107,
Yes, adding more RAM will improve the performance of the integrated graphics, especially if your memory is currently working in single channel mode (i.e. you have a single 4GB stick) and after the update it begins working in dual channel mode (i.e. you upgrade to 2x4GB). This will make your memory faster and your Intel HD Graphics will definitely benefit from the faster RAM. Actually, going to dual channel memory is one of the best ways to improve the performance of Intel HD Graphics, and here are some other methods you can apply, too, if you want to get the max out of your integrated graphics:
4 Ways to Improve Intel HD Graphics Performance
Good luck! 