They can, what I'm saying is that a single application doesn't scale well over multiple cores. Multiple instances on a single cpu generally works fine, but the

They can, what I'm saying is that a single application doesn't scale well over multiple cores. Multiple instances on a single cpu generally works fine, but the biggest impact on performance is per core speed. Edit: I was really just responding to "who spends $15,000 on a mid-high end server to run single threaded applications anyway?". I would absolutely consider this a "single threaded application".