Hi guys, I got a GTX670 in my new rig and am a complete newbie to overclocking GPUs. Can anyone guide me through on the basic steps and requirements to overclock this particular card? Thanks in adv.!

GPU variant:
Gigabyte GTX670 OC Windforce 3x (2GB DDR5)
980MHz base clock/1058MHz boost
6008MHz mem clock (effective)