How to access all the ram on my graphics card

Page 2 - Seeking answers? Join the Tom's Hardware community: where nearly two million members share solutions and discuss the latest tech.
"Can you run it" isn't exactly the most reliable source of information.

What you might want to do is run GPUZ 0.5.5 and whatever game you're playing now. Make sure that at the bottom, the box is checked to continue refreshing while it's in the background. Anyway play your game and check it after a while and see if you're using more than that.