Understanding Gaming Resolutions
Resolution is the total number of pixels your GPU draws each frame. More pixels means a sharper picture, but your graphics card has to work harder to keep up. That's exactly why many competitive players trade sharpness for speed — dropping to something like 1280×960 gives them higher frame rates and, as a bonus, makes targets look a little wider on a stretched display.
What is PPI?
PPI — Pixels Per Inch — tells you how tightly packed the pixels on your screen are. A 24-inch 1080p panel lands around 92 PPI; upgrade to 27 inches at 1440p and you're looking at roughly 109 PPI. For gaming at a normal desk distance, somewhere between 90 and 110 PPI tends to be the sweet spot where everything looks crisp without demanding a beastly GPU.
Stretched Resolution in CS2
Stretched res is a trick where you run a 4:3 resolution — say 1280×960 — and let your monitor stretch it across the full 16:9 panel. The result? Player models look wider, which a lot of people find easier to track. The downside is you lose some peripheral vision and things get a touch softer. Whether that's worth it is personal preference, but roughly half of CS2 pros seem to think so.