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.
World of Warcraft. I was on Windows XP with 512mb of RAM and who knows what graphics card but I was lagging so bad when WotLK came out.
With all the people standing at the entrance to Naxx I had to basically aim myself for the portal and lag my way in without being able to see where my character was walking due to the lag.
My parents needed a new family PC right before it first launched, and I convinced them to get a slightly better version just so I could spend the next decade of my life raiding with the homies
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.