Both motherboards don't say if they can, only the z97 anniversary says it does.[/quotemsg
The B85 anniversary most definitely does OC the G3258 quite nicely, and has an awesome fast boot post.
On stock intel hs and paste I slapped it to auto 4000 with full speed 4k core lock ( 100% cpu both cores all the time) then installed for client.
It never twitched. to win 7 desktop in 6 seconds.