290X is to compete with Titan, not the 780. So the fact that AMD's brand new flagship only beats nVidia second tier flagship by 3-4 FPS and the 780 is now over 6 months old... Not impressed. :/
that's a waste of a CPU...
you could downgrade and then use those funds to possibly upgrade surrounding hardware.
also you could go for a cheaper build all together and handle such intended tasks.
there is a list of enhancements in the BIOS update description, read up on that and decide if you want to.
some say 'if it's not broke then don't fix it' and sometimes it's cool to go by that too.
in the end it's your call.