Go Settings > Video > Resolution, and click the drop down menu:
(1680x1050 is my native resolution)
Select the next highest resolution:
Q: What does increasing my resolution have with advanced zoom?
A: You must first understand how Advanced Zoom works. Advanced zoom first zooms in your screen, and then it takes an area of prerendered pixels and then scales/enlarges those pixels into a larger viewing screen (center). Increasing your resolution higher than the native resolution of your screen means that you are rendering pixels that your monitor can't display, however, we can take advantage of this as advanced zoom will still recognize these pixels as part of the frames you are rendering, and it will give you a higher density image when scaled up.
This affects UI elements that pass through the scaled area...
And notice the increase in details...
NOTICE: TURN OFF AA IF YOU INCREASE YOUR RESOLUTION
When you are rendering at a higher resolution than your screen can display, you still have some benefits. This is also called SUPERSAMPLING, and when you do this you may feel free to turn off your Anti Aliasing. Since rendering at a higher resolution will most certainly eat up FPS, turning off your AA will help free up frames as it is technically unnecessary to have AA on while supersampling. I've had the pleasure of enjoying sharper and clearer images by increasing my resolution, while staying at a similar, or greater, FPS.
Also, AA may blur your image when you use Advanced Zoom.
Other benefits include more consistent glows, as it's now rendering more pixels to base the glow off of on sharp objects. Textures in the distance blend better. And a couple other stuff too.
Edited by MoonUnitBeta, 27 February 2016 - 10:37 AM.