First up, Voodoo 1 cards. I was quite surprised, when I did my web searching, on how many people absolutely insist that only Voodoo 2 can work in SLI mode, even though Voodoo 1 is fully capable of this. However, only one company that I can find, Quantum3D, ever added SLI to Voodoo 1 cards. They are also the only company to have single slot SLI cards available (both Voodoo 1 & Voodoo 2.) I was also wondering if anyone had ever looked into adding SLI connections to non-SLI Voodoo 1 cards? Would the BIOS need to be changed to add SLI to such cards? I've discovered that is actually quite easy to add RAM to Voodoo 1 cards, so taking 2 6MB Voodoo 1 cards, converting them to 12MB cards, then adding in the SLI connection would seem to be a nice project for someone 😀 I don't have the slots for it, without removing my NIC card (though I guess that could be an option,) so I'm not really prepared to spend the money necessary for it.

FYI, instructions for updating RAM on a Voodoo 1 card 😀
Framebuffer: 2M standard, 4M max
Texture: 2M standard, 4M available, 8M max
4M Card 2M/2M (Double Both to 8M 4M/4M)
6M Card 2M/4M (Double Both to 12M 4M/8M)
8M Cards exist, I'm told, but have never found any. Probably 4M/4M if they exist (Double Texture only to 12M 4M/8M)

Framebuffer Increase:
Stack chips on top of each other soldering pin to pin except pin 14. Measure connection of pin 14 of the already installed chips to FBI to see which pin each chip is connected (either 124 or 125.) On the ones connected to 124, the new chips will connect to 199. The ones connected to 125, the new chips will connect to 180. All will connect through 22-47 Ohm resistor. So Pin 14 -> Pin 14 -> Resistor -> Pin 199 and Pin 14 -> Pin 14 -> Resistor -> Pin 180.

Texture Increase:
Stack chips on top of each other soldering pin to pin except pin 14. Run connection from all Pin 14's to TMU Pin 130 through 22-47 Ohm resistor. So Pin 14 -> Pin 14 -> Pin 14 -> Pin 14 -> Pin 14 -> Pin 14 -> Pin 14 -> Pin 14 -> Resistor -> Pin 130. (depending on RAM, this assumes 4M)

The same can be used to increase RAM on Voodoo 2 cards, though the Texture RAM max is 16M instead of 8M. So it should be, theoretically, possible to take 12M Voodoo 2 cards, and make them 20M Voodoo 2 cards. I wonder what the performance on those would be? I'm also wondering if a Voodoo 3 card could also be upgraded in this manner 😀 The SLI on Voodoo 2 cards is also rather standard, so they wouldn't have to be modified for this like almost all Voodoo 1 cards would. The only issue there is covered in my last question 😀

Finally, how do the single card SLI Voodoo's rate? Lets assume, for arguments sake, I managed to track down and purchase single slot SLI cards to replace my current Voodoo cards. Those would be Quantum3d's Obsidian 100SB-4440 and Obsidian2 X-24 boards. Both are actually 2 12MB SLI cards together on a single PCI card. The first is Voodoo 1 and the second is Voodoo 2. How would the performance of each compare with the dual board options (Voodoo 1 would be the Obsidian 100DB-4440 and Voodoo 2 would be a myriad of possible make/models?) Has anyone done any tests with these options? I would assume that the dual board setup would out-perform the single board setups, but is it by a noticeable amount?