This is possible because the HD 4000 family uses the ancient driver interface that didn't have a low resolution check. With newer cards, you can't add low resolution on stock drivers (unless you use this method).
Very interesting.
Which series was the last to use that "ancient driver", 4000? 5000? Do we have a list?
I'd like to know which model to buy, preferably the most powerful that also has that driver interface so I could use super-resolutions without the need of restarting in Test Mode, and if I don't find a good offer, look for the one below it, and so on.
Also apologies for necroposting, just thought the answer would be useful for peopel who are in the same boat as me.