Yeah it's as bobjim (wish I was cool enough to have two names in one Bro) said its x30 damage of what you initially dish out, so if your dagger does ten damage it's 10x30, but if you do a power attack it's 20x30.
Thanks for repeating what I said, really helpful. Also thanks for the equally mundane point about my name.

I simply enjoy smithing, whether it's necessary or not. It's very satisfying for me to be decked out in armor and using weapons which I made myself. The point of the game is to have fun, right?
Thats great then, if you're happy then do it. I don't enjoy being overpowered, so I don't smith. He was suggesting you would need to have the smithing perks to use that high level weapon, which you don't.
There is no sneak power attack.
Yeah, there is. Power attack whilst in the sneak position, you will do double damage before the sneak multiplier is added. Also I believe when an animation happens, your damage takes the damage of a power attack, even if you normal attack.