Characters

i have been trying to create a password and it's telling me that i need a special character and an alpha character in my password, what's the difference? I looked up what the difference is and i get the same results.

Hello. What exactly am I supposed to look for when judging if I should continue overclocking my GPU? I am using "Heaven 4.0" and slowly raising the memory clock on MSI Afterburner. So far I'm up to 550, and I haven't noticed anything that wasn't also there, when it was on the default. I am not...