The gaming PC I bought in 1998 is still alive and well and repurposed :
Code:
# grep "model name" /proc/cpuinfo
model name : Pentium II (Deschutes)
Don't quite remember what happened with the 8 MB Voodoo 2 card it had (a Monster 3D II, after I sold its original Voodoo Graphics based Monster 3D), but I know the Sound Blaster AWE64 is in a box somewhere, next to the Sound Blaster Live! that upgraded it and both still in working order. However, it's current AGP GPU, a Matrox Mystique G200 still works fine :
Code:
# lspci | grep "VGA"
01:00.0 VGA compatible controller: Matrox Graphics, Inc. MGA G200 AGP (rev 01)
So no, you won't damage anything by gaming on your computer. This machine lasted me close to 12 years now and it's still running as buttery smooth as the day I bought it. It ran through countless games of Quake, Quake II and Quake III, not to mention all-nighters in Unreal Tournament. All under Linux too, why shoddy open source drivers and narry a failsafe in place. Before I switched it to Linux and went all Quake on it, it played through things like Jedi Knight, Final Fantasy 7, various MechWarrior titles and dozens and dozens of benchmarking runs.