Easy to get his confused. AMD "Dual Graphics" is relatively new, and combines the on-chip graphics of A6, A8, and A10 chips with a *LOW* end discrete graphics card. Officially up to a 6670, unofficially 7670. Only Directx10 and 11 are supported, and only Vista and newer OS. If a more powerful card is used the on-chip graphics are disabled. While Dual Graphics was a nice idea, it is rarely used since most people buy a decent video card which quickly outperforms any Dual Graphics combination.
Much more common is AMD Crossfire or Nvidia SLI, which uses two dicrete video cards that are virtually identical.
I think the cpu-z will only detect it after there a card installed....
So, If i install dedicated graphic card, The on-chip one Wouldn't run?
If it Cfx (dual graphic) compatible card it will run together, if not the only one that running is the one the monitor connected (if connected with mobo then the onboard running, likewise if it the card then the card running the onboard off)
since higher tier/level dedicated card is much more powerfull, onboard graphic (APU) is not needed anymore....
if it Lower tier (CFX compatible) they will runing together to increase it performance but it will still lose from the high tier dedicated card.... (the only reason is money/budget since low tier cfx capable card is cheap)