I had that same APU + dual graphics in a HTPC I built awhile back. The dual graphics worked quite well, but the improvement over the single on-die GPU wasn't very much. I would say disable the 7660D and go with the discrete card.
If he were to use discreet graphics only, then he shouldn't use and APU in the first place, because he will be paying for an additional integrated graphics chip he'll never get to use.
If he were to use discreet graphics only, then he shouldn't use and APU in the first place, because he will be paying for an additional integrated graphics chip he'll never get to use.
Not much different than everyone who bought an IB or SB w/on-die gfx is it? The 5800K is right up there with the Phenom II x4 BEs in gaming power.