Im not sure which models corresponds to which terminator, so please assist:
T-800 = Good ol' Arnie
T-1000 = Liquid metal terminator in Terminator II
T-X = Queen be-atch of robotics
A marine would probably beat a T-800. The T-1000 Is a real problem though. Neither bolters, chainswords, fists, or even power weapon/fists i think would harm it, as it would just melt back. And remember it can change shape too, it doesn't need to on the shape of a humanoid. Maybe it would just throw itself at the marine, and melt into all the cracks and stuff of the marines armour, and kill him that way. Remember when i melted through the prison bars?
The T-X would outright kill a marine. Its WAY faster than a human, so i think it is reasonably faster than a marine too. Pluss, you have to penetrate quite deep on it before it wouldn't be able to melt its armour back into place.