A Viper V330 is a Riva128 based card, not a TNT1.
If you replaced a V550 with a V330, make sure you load up the drivers correctly. The Riva128 is an NV3, the TNT1 is an NV4; the drivers are not completely compatible with each other as the current TNT/TNT2/GeForce/GeForce2/Vanta/M64/MX group.
Also remember that the Riva128 was optimised for speed against the Voodoo 1 and had some very strange graphic anomalies such as square textures only and odd banding.
Final Fantasy VII players will know exactly what I mean.....🙂