DOOM 3 Hardware Guide: No more speculation, this one's official

Today, id Software released the official DOOM 3 Hardware Guide on HardOCP.com:

Our goal here is to help you understand where your system is positioned in terms of playing DOOM 3 and to help you
choose an upgrade that will make a real difference and offer you the greatest improvement in gameplay for money well
spent.

The guide certainly lives up to this goal, covering every nook and cranny of a variety system types in great detail.  See it for yourselves, just follow the link.