Yeah I know I want that wallpaper!
I wonder if he has other ones too, I love Britterz
Anyway, if you can manually take it to 1.7-8 then try. I don't recommend doing 1.9v+ without extreme cooling, 1.8v should be enough, if you're not stable by then then either your CPU cooling or northbridge cooling isn't getting it done, or your chipset can't be pushed higher. OR, if you have a weak Powersupply.