Instead use MSI Afterburner.
It has got a sleek GUI and is very easy to use.
Just raise Core Clock to around 150 Mhz higher and Memory Clock to 200 Mhz higher. Apply and save it. See if you get too high temperatures. If yes, lower clocks by a bit, if not, set it to that and you have a decent overclock with noticeable differences.
You can even go higher if your card stays cooler after said settings.