Regardless, the Dell U2311H ignores any scaling information given to it via the GPU and does it's own thing. It never loses any of the image (overscan) but monitor scaling overrides preferential settings on the GPU.
GPU scaling doesn't work that way. The GPU does not "give" the monitor any scaling information. The GPU just does the scaling, and then gives the monitor a native resolution picture. The monitor
can't "override" the GPU's settings - it's physically impossible. For all intents and purposes, the DVI cable is one-way communication - the monitor cannot send instructions back to the GPU.
Think of it like this. You've sold 480 units, but your boss expected you to sell 1,080 units. Monitor scaling is like this - your report says 480 units, and your boss inflates the figure to 1,080 units, but he sucks at lying, so the final report is clearly distorted.
GPU scaling is like this - you inflate the figure to 1,080 units yourself, and hand that in. The boss thinks you met expectations, and files the report exactly the way it you wrote it. You didn't tell him that this figure is inflated, so he has no idea you are lying, and it is impossible for him to "override" your lies with his own spin, nor is there any reason he would.