that is the older A10 and they only work in CrossFire with the HD6670 or HD7730/50
the 7850K can Crossfire with the HD7750 R7 240 and R7 250
you need to get your facts right
the 260X is way higher tier GPU and will not work in tandem with the onboard GPU
many have pointed out the mis-match DDR3 will slow down GDDR5 just to be on par.
hmm the 250X is like HD7770 series
maybe the iGPU need to be OCed and the RAM speed set to the highest possible speed