Actually, 2 V2's connected SLI is just a little "slower" than a V3.
The V2 cards have no onboard 2d, and require another card for the 2d.
They came in 8meg and 12meg versions.
Some newer games will not work with the V2, as it's 16bit only, (like Links 2001).
The company that made the card, 3dfx, is no more.....
A year ago, you could have bought the 3dfx V2 1000, which was a 12 meg version, for $20 at Staples, after rebate. (I bought 2).
Today, you are better off with a used $40 V3, as it's more powerful than 2 V2's, and 1 card will do what would take 3 cards to do if you used the V2.