DOOM3 is the most advanced game id has ever released when compared to what everyone else is doing. But I'm not complaining about it. The truth is, PC hardware is running downhill with no breaks; it's never going to stop. It takes real guts and innovation to set the standard for graphics in an industry that has gotten a little complacent.
Most games now look the same. I run them all at 1024x768x32... they all look neat. DOOM3 is going to be the first game to actually stress out my machine, along with everyone else's, in a long time. If DOOM3 wasn't comming out, I'd still be using my 1700+ w/ 512MB pc2400 and laughing at everyone who bought a 9800.
DOOM3 and Half-Life2 are single-handedly driving hardware sales right now. Offices don't need new hardware. 450MHz Pentium II's run Microsoft Word just fine. The only thing that means anything for hardware developers right now is security and games. That's it.
Look at all the big names that attend LAN parties now. ATI, NVidia, AMD, Intel, 3com, Linksys, Logitech, Microsoft, Cisco... CISCO! The times are changing. Enterprises are no longer the driving force of hardware speed. It's all about the games. If you look at the last beig expo TomsHardware went to, you'll see that most of the coverage was comouter case mods, water cooling systems, and hot looking hardware in lots of different colors. It's all geared toward the gaming enthusiast.
JC is saying that, if you're building a DOOM3 machine on a budget, don't replace your TNT2 with an MX card because it's junk. Get a GF3 or a Ti4200. DOOM3 will run on a GF1 or a GF4MX, but remember that these are the MINIMUM system reqs, not what they reccomend.