You're not a million miles off 860k performance with your current apu.
A 470 is honestly a viable buy IMO, there is absolutely no point upgrading that APU to another fm2+ socket chip , performance gains would be minimal.
People have pushed 4.4ghz on that chip easily with the igp disabled , you're then in 880k territory .
Is your CPU an optimal pairing with a 470 ?? No probably not , it'll still do an acceptable job though.
You may get drops to mid 40s on mainstream AAA titles but you'll be able to up graphics settings significantly.