3dfx died because they decided to make thier own cards and not supply chips to third parties.that left all the companies that made 3dfx chip cards looking for another source[nvidia].poor company leadership decisions and not being able to get thier cards to market killed 3dfx.
No. That is not why 3dfx died. 3dfx did this just fine with their early Voodoo cards, and extremely successfully with the V3. What happened to 3dfx was a monster called the TnT2 Ultra, and its much bigger, asskicking brother called the GeForce 256.
It never was a contest, and it was a fucking demolition when comparing the V5 to the GF.
Thats why 3dfx died.