What was your first videogame that made you say "Ok, I need to play this game properly: I need to upgrade my specs"?
Going back to your beginnings in PC gaming: the first game you played and loved, but the frame rate and resolution weren't ideal. Your first "I need/want to upgrade my specs" basically.
Half-Life 2. I remember being completely blown away by early source engine, even on low graphics to keep the frame rate above the 20s. I watched the weird little graphics benchmark animation probably a hundred times to dial in the settings. If you told me that in the future I'd be capping the framerate on highest settings to keep it from hitting the default limit of 300 I'da called you a liar.