Are there any AM3+ mobos with onboard video ? = NO not on 99x mobos and there will not be any 1xxx mobos with onboard video either. AMD has APU now for cpu and video on the same mobo from same chipset/cpu.
Mobo companies have gotten FX to work on 890 chipset motherboards, but I honestly think there is still a difference between 890 and 990 for FX processors, no matter how often FX processor is used on 890 boards. Call it intuition.