Hello I would look on the Asus site to see if the FX-8370 is supported by your board. If it is there should be a newer bios you could update and install. Sounds like you haven't updated your bios in a while.
Do you mean 9370? http://www.asus.com/Motherboards/CROSSHAIR_IV_EXTREME/#support bios 3027 Although that cpu is not listed in the support cpu's under this beta bios, this update was provide 11/08/11 for the fx's .. and is the last one. The 8350 has been reported as working with this bios. What bios is your board running now ?