Microsoft has launched a game advisor that will compare your system against the minimum and recommended system configurations and let you know if your system is capable of playing a particular game. There are massive lists by game type and the list is searchable. The results are subject to personal opinion as it lists a machine with a Pentium 4 1.5 ghz and Geforce 4 ti4600 as capable of playing Doom3. While this may be true the frame rates you will see might make game more akin to a slideshow than smooth action.
Head over and check out your rig.