you have to understand that the term MX on a nvidia card means that its less powerful than the "vanilla" unit of the same line. For example, the geforce 2 mx 400 (which i used to own) is less powerful than the geforce 2. and the geforce 2 is infintley less powerful than the geforce 4. the geforce 2 WILL NOT run doom 3. it lacks the right shaders. I suggest you get a new card, as the geforce 2 will not any new games (Far Cry, Doom 3, Half life 2...).
To summarize this, the geforce 2 mx400 wont run Doom 3, and it is much less powerful than the geforce 4 mx 400.
If you are still determined to try, go to www.activision.com
and send a letter to their tech support asking them if it will work.
Just buy a new card though
-AMD Athlon 64 3200+ Winchestor
-MSI K8N Neo4-F
-Sapphire Radeon X850 XT
-2x 1024 Corsair XMS Pro
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