Is it still true on the newer version of Afterburner and the newer GPU architecture that when you're overclocking that you need to go up by +15 increments? Or do the clock speeds increase at whatever you set them? As in +5 or +10?
The reason you go in increments or decrements when overclocking or undervolting respectively is to make sure what you're doing is stable in the long run. Just punching in a number and hoping it works often leads to instability issues and leaves you wondering what caused it...meaning too many variables. So you work you way up or down in gradual steps.