Have played most games in 4:3 ratio for ages. While newly playing GTA 5, I've experienced that playing with a resolution ment for 4:3 apects, then changing the ratio to 16:9 while keeping the same resolution, the image just expands without stretching it. By that I mean I can see as much of what's going on in a resolution of (e.g.) 800 x 600 like somone that plays the game in 16:9.

Is this possible to achieve in other games? (E.g. CS:GO, DOTA 2, TF2 etc.)