The best games now in my opinion: World of Warcraft Gears of War Forza Motorsport The best games ever: Tetris Diablo Starcraft the original Command & Conquer Doom II the Ultima series
Counter-Strke:Source World of Warcraft Those are the only performance-intensive games I've played online long term. I don't play WoW because it got repetitive, and I quit CSS because it is too addictive, and I have work that needs done
Have you guys ever heard of a game called Vanguard: saga of heroes? That game can really bring down your PC...
I remember the big uproar when Vanguard was released for beta - you literally needed a mammoth amount of RAM (4GB!) for it to run efficiently. Any less and you'll be stuck with lengthy loading times and lag.
My computer is no slouch when it comes to playing games but Oblivion certainly gives it a good workout. Two 7800Gt's in Sli and it really struggles on high detail settings. Best game ever for me was the original Half-Life. Even though it looks graphically dated now, the storyline was amazing.
Definitively Gran turismo! btw did you saw the latest screenshots for GT5? If you are GT fan then quickly go check them! GT5 : prologue