The AMD Dual Graphics option (crossfiring a discrete graphics card with the integrated graphics) still isn't perfect. For the games it does work with (because it's not guaranteed to work better) the real-world perceived performance isn't much better because there are a lot of dropped/runt frames.
So, unless you plan on getting a GPU to use discretely, I would recommend upgrading your RAM.
Your motherboard supports, with no issues, up to 1866. This would get you a noticeable jump in performance that you might actually consider worth the money to upgrade.
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231455 Theoretically, your motherboard will support 2400 RAM, so if you wanted to eke out a little bit more performance beyond 1866, there are these options:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231689
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231667
I am not a RAM expert though, I would try to get ahold of someone who knows more about RAM compatibility and motherboards. I, personally, own an A10-5800K with 16 gb of Ripjaws X 1600 (got it for real cheap during a Black Friday sale; I know that 8gb is more than enough) and it worked fairly well. I could play some of the newer games, like Tomb Raider and Bioshock Infinity on standard graphical settings with decent FPS, and turn some of the settings up to Ultra and still get an average of around 30 FPS. For me, upgrading my RAM to obtain better performance was a dilemma, because if I spent just a little bit extra, I could buy a decent discrete GPU and have a far better boost in performance. In your case, since you'd benefit from both having more RAM, and faster RAM, I would say it is more worth it to buy the RAM over a low-tier GPU.