RAM speed for Radeon HD 7640G

I recently bought an Acer Aspire V3-551-8887 with an AMD A8-4500m and a Radeon HD 7640G integrated chip. I've heard that the performance of the chip does depend partly on the speed of the RAM, and was wondering if there would be a performance boost if I upgraded my current RAM (4GB 1333Mhz) to a faster set of 1600Mhz RAM? I know it'd be capped by mostly the core clock speeds, but I figured I'd at least look in to it!