I dont measure per hour but you can run Scrapebox around 200 connections and then just fire up multiple instances to the point your resources max out.
GSA can run only 1 instance and about 300 to 400 connections is where it maxes out. You can run more then that but you start to get significantly diminishing returns.
However I can't really directly answer your question, because in 11 years people always ask how fast can scrapebox go or how many connections an hour or how many links an hour, I don't know. I focus on getting the links I need, so quality first. I know speed is important to some degree, but I set out to get what I need. If a server does it, great, if its too slow I upgrade or I am patient. Speed is just not a factor that I approach it from so I don't know.