If you're switching from GUI to console, there's a "Pause when done" option. When it's done, shut it down and uninstall then install the console version. I've got a number of identical machines, several run the console, most run the gui(not the screensaver though). They are all clipping along at the same number of WUs completed more or less. One day one is ahead, the next it's a different one. Dynamic equilibrium, so in my opinion don't change to the console purely to pick up some cycles because you frankly won't notice any difference. There are other valid reasons of course, clean system tray, runs across various accounts, etc.
"Dynamic equilibrium"...I like that term. :)
:O)
P