Monitor overclocking Ubuntu and AMD

I followed Wendell's guide on overclocking with CRU.exe by toastyx. I got my DVI monitor to 70 hz without the ATIpatcher.

I recently installed Ubuntu Gnome 14.04 and I got the AMD drivers working, now how do I overclock the monitor? I actually do notice a difference between 60 and 70 HZ in RTS games and it's a deal breaker if I can't change it.