The latest games that my kids have bought have needed a minimum of 64 vid. I found that the 32 I had onboard was not enough to run many games well so I bought a 256 nvidia card & it plays anything that I ask it to. I think that the minimum for a new card would be 128.
I am thinking that having only a 4 meg video card that your pc is very dated and cant play the latest games because it wont meet the minimum requirements for cpu or ram. In which case you will probably be playing games like W&W or Baldurs Gate. These games will play ok with 16M video. Wizardry 8 requires 32M to play well.
Playing the older games on these forums will keep you occupied for years without having to have the latest & greatest computers.
BTW W&W will play with DX9.
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