i dont know about this in great detail, but generally, additional computers would be faster. its easier to add another computer to the que to help out render times, than to improve the computers' specs.
atleast, for the studio i work at. i find that sending shots through a farm on many computers beats less computers that have more power. the shots we work with can be fairly large, and take up to 5 minutes simply to load it up. for 1 fast computer to load up the shot, and render frames, it would end up taking longer than say, 5 weaker computers all loading it up, and rendering.
although for multiple computers, we sometimes get one computer that screws up, so every few frames will have some kinda glitch like missing textures etc ;[
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