I have this CPU too before. But I keep it in my closet co'z I'm using Athlon 860k right now.
I tried pairing this APU with r7 250 in dual graphics mode. Performance has mediocre to major boost in dual graphics. Later, budget set in to my pocket then I bought an R9 380. Improvement is really awesome with this GPU. From 30-60FPS, it jump to 60-120FPS. I dont see any bottleneck or whatsoever base from my experience. Then my Gaming became smooth than usual.
Later, I changed to athlon 860k because this APU can't be overclock.
Actually as of now im building a new kaveri system with this apu from my closet.