*stares* Is... is that cost efficient? I mean, what's your normal core/ghz amount, and how many times that did it take to get a 3/4ths to 5/6ths reduction in build time?
So, here's how it works: Incredibuild is a distributed compiling environment. You tell your project to build through the Incredibuild client, it tells your local server machine about it. The server machine then dynamically allocates all available Incredibuild client machines connected to it between whatever build jobs are being done. As most big projects have tons of files to compile, they can trivially split off into their individual files, sent out, and compile to the intermediate files in parallel. The intermediates then get sent back to the originating client, which then does the serial task of linking them together. Those machines can then be routed to other tasks, as they can't really do anything while linking; and it reallocates machines back (though not necessarily the same ones in the pool if there's multiple builds happening) if there's more work to do later.
Now, the important thing here is that when coding, you aren't compiling all the time; in fact, it's probably only a few times a day that you need a full rebuild unless you're messing with headers deep in the solution. As a result, your machine is normally idling while you code, then goes to 100% on all cores when you build. With Incredibuild, you utilize this fact to have all clients acting as build machines. So rather than separate hardware, it simply tells every machine in the office "Hey, build Alway's code!" And in the background throughout the day, my machine and those of everyone else will also have some of their otherwise unused compute power grabbed for useful purposes. So in an office with dozens of high end workstation machines, you end up with the equivalent of a small cluster supercomputer for everyone to run their builds on. Of those 5 minutes, probably half or more is spent on the serial linking phase (much more in Release mode, as that uses optimizations which take a much longer time to link)
So basically, free computer-magic!
aside from software license costs