Todd Hollenshead, id's chief executive, said Doom 3 will require:

- A 1.5-gigahertz Intel Pentium 4 chip or AMD Athlon 1500.
- 384 megabytes of memory.
- Two gigabytes of hard drive space.
- An nVidia GeForce 3 graphics card or better; or an ATI Technologies 8500 or better.
If your existing rig doesn't meet these specs, here's a guide to beefing it up to play Doom 3 in all its gory glory.

If you're upgrading, look for at least 128 MB of video memory in a card with Direct X 9.0 capability that installs into an AGP slot. Cards in the $150 to $200 range - such as a GeForce 5900XT or a Radeon 9600XT - will be a sweet spot.