Asrock 980 DE3 r2 or Asrock 970 DE3 r2?
The 970 is OK for OC but hasn't a heatsinked VRM so is limited as to what you can do. And its only 4+1 power phases which again limits you. There's no detail on Asrock 980 DE3 r2.
- says it has 760G chipset.
There's not enough info available. So I'd play it safe and avoid OC.
The fx6300 will self turbo to 3.8 any way.