You'll find a lot of reviews that show the Silver Arrow (both types) trade blows with the Noctua NH-D14. I think it's safe to say they are, roughly speaking, equal. I would probably be happy with either product, so I say just get whatever is cheaper. The tinkerer in me, though, says, since you already have a Noctua, go ahead and buy the Silver Arrow and give it a shot. Worst case scenario, you still get to tell us your experience as to which was better.