Here a very nice video of an interview with Raff (If I recall correctly) from PC Gaming & Hardware.de & Voodoo Alert.de about how 3dfx was founded right dow to all the3dfx graphics chips they made, info about the Voodoo5 6000 even the Rampage is told in tis video as well and many other things but also what killed 3dfx and what went wrong:
PCGH (english) - "Rampage was an awesome Chip!" | Interview with 3dfx-Founders Scott Sellers & Ross Smith!
Interview Timestamps
01. 00:00:00 - Intro
02. 00:00:28 - Scott Sellers on founding 3dfx
03. 00:06:03 - Focus on arcade games
04. 00:08:55 - Original Voodoo chipset
05. 00:14:12 - Outsourcing Geometry-Processing onto the CPU
06. 00:21:10 - 3dfx vs. Nvidia
07. 00:25:32 - Voodoo Improvements over Time
08. 00:28:00 - Rampage - too late for a Gamechanger?
09. 00:29:32 - Rampage - rumored Specifications
10. 00:31:58 - Deferred Rendering
11. 00:35:05 - Rampage Fabrication Process
12. 00:35:28 - Glide API
13. 00:40:58 - What was the Killer-App for Voodoo? (Scott)
14. 00:48:50 - Are you (still) a Gamer? (Scott)
15. 00:50:03 - Ross Smith on the Names '3dfx' and 'Voodoo'
16. 00:54:20 - Business Plan and Game Recruitment
17. 00:58:30 - Entering the PC Gaming Market
18. 01:02:05 - Quake on Glide
19. 01:04:30 - Game Knowledge is important!
20. 01:05:45 - What was the Killer-App? (Ross)
21. 01:07:30 - Bad Decisions
22. 01:11:30 - Voodoo Rush
23. 01:16:09 - Success of Voodoo 2
24. 01:17:15 - Entering the Board-Market
25. 01:20:10 - Canceled Deal with Sega
26. 01:24:21 - Voodoo Impact on the Gaming World?
27. 01:28:40 - Are you (still) a Gamer? (Ross)