My very very first video card was a 12MB Vodoo2 back in or 1998? I got them 2 weeks after win98 came out then my second card was a 12MB Voodoo2 thats right 24MB SLI. I had a montigo bay sound card and because the Voodoo 2 where 3D only so you had to have a seperate 2d card after I added up all those cards and everything else I had in my computer I ran out of IRQs and had to ditch the high end sound card for a cheapo sound blaster.
This is what the back of a typical PC would have looked like if you had 2 Voodoo 2 cards and a VIA 2D card looks like this persons computer had cable/token lan but I was rocking the 10TX baby! I don't know if this is still how dual GPUs work but when that card came it if you had 2 one ran the vertical and one ran the horizontal.
So I was rocking 3 graphics cards in 1 pc 14YRS ago. I was also only 15 and had used my birthday + Christmas money from every single relative put together and then begged my mom to float me the $50 for the mail in rebate.