Overclocking multiple GPU's

[notlist3d]

What is the best option to overclock multiple GPU's.    I have one rig with 2 7970's and a 7950.   Am i overlooking a setting to change between cards in amd overdrive, and gigabyte software?

What software will allow me to overclock each GPU with separate settings?

[BTCNations]

MSI afterburner is what you want.

[sameev29]

Watch a tutorial first at youtube before doing it just to be safe.

[varunsin]

any possible way to undervolt them??
P.S. running Ubuntu 12.04 x64