120mm fan off motherboard header?

Can i run 120mm vantec stealth fan off the motherboard and control it using speedfan?

yes

they draw very little amount of power so it should be fine, if in doubt conatct the mobo maker.

It'll be fine :)
Just dont get putting a 120mm delta on there :P

I'm gonna get a DFI Lanparty NF4 ultra so i think it should be fine, but will i be able to change the speed using speedfan?

lol i done that withmy delta fan, it deosnt damage your motherboard at all, it just stops the header from working :/