i would go for even faster ram at the same amout if thats all we can find, ive been looking for that 128mb gforce but it seems to be either not made or gone ???
http://www.tech-report.com/onearticle.x/2598
also i want to say in a post months ago i said my v5500 had 5ns ram, well i got glasses and its 6ns,  which i must say was a let down, but i still can hit the 200 mark so i figure faster ram would be nice to try.

ok help me here ??? im not a tech, the v5500 has 8 rams for 64mb, so ive been looking for cards with either 4 rams at 64mb or 8 rams at 128mb, now am i all wrong or what because thats what i thought was needed, like i said im not a tech so i could be all wrong

ahh, ill have to read that several times, 

Is that the one we need   ???  great job if it is , if your sure this is the right one we must contact right away and try and get some, let me know, by the way thank you for looking

hi everybody. i have a V4 with toshiba tc59s6432cft-60, but my V4 will never die. i say this because one time i tried to change the cooler, and the cooler was not well glued... my V4 began to do very strange things. suddenly, my V4 dead. the pcb was full of thermal compound... i was very angry so i cleared ir whit water, shampoo, soap, alkohol, disolvent, ... the video card was really dead, or killed xdd. then i saved it into his box

two years later, i was at home very bored and i decided to test all my hardware. i was very surprised when after putting and thermaltake vga orb the voodoo4 returned to live. now my V4 is a zombie. but works, and that idea of increasing the video ram seems very interesting. i always wondered why the V4 has 4 free slots

ill try to find 4 more toshiba chips. the soldadure is another history...

one more thing i wolud like to say. in the top right side corner there should be a condensor (=capacitor): the C131. but, my board dont have that capacitor. i dont know what i did whit it, but one day dissapeared haha. its incredible that my V4 continues running whithout one capacitor, dust in the pcb and into the vsa-100 chipset, and a heavy load of water, shampoo, alkohol, desinfectant ...

Hm...

That C131 is exactly the same like the C64 (right above the Fan Power Connector), or the C7, C41, C46, C71, C75 etc...

Marking :
10
16S
0G2

some very rare Voodoo5 cards have  5,5 ns rams.  and they are not protetypes , they are retail cards...  you just have to be lucky..

I found Logicalmadness just posted this in the x3dfx Forum (Link) :

http://www.ensil.com/international/services/rework.html

Don't know what prices those guys to take for a rework (or enhancement for that matter) of damaged or rare Hardware, but they got a plain contact address listed (no hassling around Web Forms).

For some of those 'special needs' , and/or for special Hardware, a professional job like that might be an Option