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Apart from the 3dfx Voodoo cards I wouldn't say any single card has had that big an effect on the computer games scene, but incredible cards would be:
Voodoo 1/2
Geforce 256
Radeon 9700 pro
Geforce 8800 GTX
Contrary to reviews at the time (especially as 1998 was when the V2 launched). Then again it has been shown that your recall of events at the time seems to be somewhat clouded.SGL was the premier version as I recall it had the more advance features and ran faster. I think you might have been right it was early 1998.
Yes and I remember there being a whole generation or 2* of 3Dcards and 3Dgames before the V1 and PCX1. Voodoo where not a big step as many people made out. It did add to the market but I dont see it as a card that changed everything. It was a popular card but it didn't change that much. It didnt make games look better over other 3Dcards, it didnt bring lots of new features to the market.
*Some say 2 generations, depends on how you count.