Asus has listed which of its motherboards support AMD's FX-9000 series CPUs.
Earlier, when the FX-9000 series of CPUs from AMD was released, they were released to OEMs only. The reason for this was because the CPUs had such high TDPs, so various manufacturers still had to test the units in their motherboards to confirm support. Later though, the CPU also became available through retail channels and can be purchased separately.
Of course, to make a name for themselves, manufacturers (such as Asus) list the names of their motherboards that support the CPUs. Asus claims its Crosshair V Formula-Z, Sabertooth 990 FX R2.0, and M5A99FX Pro R2.0 motherboards support the FX-9000 series CPUs. A BIOS update won't even be required, though the motherboards do all need to be of the second revision.
If you're uncertain though, always be sure to look up CPU support on the manufacturer's website for your particular motherboard. Not only this, but if you do intend on using an FX-9000 series CPU, AMD also recommends the use of water cooling as well as a minimum of a 1200 W power supply, though the latter might be slight overkill.