Actually four VSA-100's should work fione with the DVI-D port.
As one of my x-3dfx tech members told me clearly:
The way VSA 100 works is that there is one master and a variable number of slaves. The master is the only chip that actually presents a finished image even though all the chips split rendering load on the scanlines. Thats why it doesn't matter how many chips there is because the image sent to the ADC is from one VSA chip.
Even if you have 8 or even 16 chips DVI will work just fine, the V5 5500 PCI Mac is clear evidence that this will work, 3dfx knew what they were doing back then so as the 6000 goes giving it a DVI would of been more sensible.
Also the 33Mhz bus will limit the shit out of this card, if 3dfx knew 33Mhz PCI was fine they would of made their expensive Voodoo5 6000 Prototypes with a PCI Connector, yet they didn't.
Most gamers use AGP and not the slower 33Mhz PCI, for a 5500 it may not differ much but when using 4 graphics chips on one card and at high resolutions like 1600x1200 this will differ a lot more.
Games like Descent 3, Freespace 2 & UT GOTYE 1999 with the 32Bit Glide Mode + FSAA things will get very heavily loaded and the 33Mhz Bus speed will make the card suffer big time.
Also not every PCI-X Slot can be set to 32Bit 66Mhz either, not all mainboards have that option, the card also needs a PCI 2.3 connector if you want to fit it in any PCI-X slot, 2 notches are of need,as where the Voodoo5 6000 PCI in this thread has one notch in the rear like how a Voodoo2 has, this too will form problems.
So not much of an improvement across the board somethings are improved like the much higher quality capacitors and such
Hank also told me that the 66Mhz Bus speed was needed to maintain optimal performance at higher resolutions.
So in the end maybe Anthony did something wrong when it comes to saying that 4 Chips can't work with DVI, never made sense to me tbh 
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it's hard for me to explain the same things over and over. just search for difference between earlier (intel) and later (plx) v56k prototypes.
for those who own the very first revision of this card, and would like to run it on a 66mhz bus, i made a special gift:
https://www.modlabs.net/uploads/gallery/blogs/mini/1121.jpg
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Those cards ran with a 66Mhz bus and not a 33Mhz bus that would of limited those cards.it i fine to be wronng ya know , all you have to do is to admit it, apparently you lack that perk.
333Mhz Bus will castrate the needed bandwidth for a Voodoo5 6000, all 6000's 3dfx made use a 66Mhz bus, I know this as a fact thanks, the people that created the cards told me in person and I am sure they are in the right here 
My friend at x-3dfx is right he at least gets it hehe, your design isn't all too improving if I really have to be honest, the original 3dfx cards use the 66Mhz Bus via the AGP port, it's just more sensible, GrandAdmiralThrawn you made valid points when it comes to this. at 33Mhz bus the card will suffer big time.
For the blind ones:
As the V6K FAQ that I help make with, omega_supreme, Nightbird, osckhar, Gary, Hank and some others clearly explains
http://www.thedodgegarage.com/3dfx/v6k_faq.htm
It's important to STRESS that you must NOT overclock the AGP/PCI bus as it is a sure fire way to piss off the HiNT chip and leave you with a DEAD V5-6000!!!!
--> 66 mhz is what it was designed for and you should not exceed that at any time if you value your V6K.
So coming back to that the 6K was designed to have a 66Mhz bus and not a 33Mhz Bus
Yes they were seen as Voodoo5 6000 PCI, but with a 66Mhz Bus never a 33Mhz Bus, that would simply Cripple the card like crazy.
I am pretty sure 3dfx was aware of this, or all the 6K's would of had 33Mhz PCI Connectors which is not the case.
(I know, no legacy OS support etc, just for theoretical example).