kanecvr wrote:

Fun little fact - while playing around with the drivers, I found "digital SLi" and "SLi Compatibility" under 3dfx advanced features tab. Makes me wonder if one could chain up two voodoo 4 4500 or voodoo 5 5500 PCI w/o a bridge for better performance...

Wile technicality possible it will not have the affect you looking for. We were taking bout it over on falconfly.de always back.

Also a 1.5v agp slot will not do anything bad to the card other then make it unstable. If I recall most off brand 4500 had problems with 4x and 1.5v

According to this thread here: http://www.3dfxzone.it/enboard/topic.asp?TOPIC_ID=2104
Some of those cards were keyed incorrectly such that despite the 4x keying they were only 2x cards.
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I suspect that some companies upgraded their PCB layouts to 4x before they exhausted their stock of 2x chips.
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There are no vsa100 chips with support only 3.3v and/or 2x mode. All of them are support 1.5v/4x mode and 3.3v/2x mode at the same time. Configuration done thru strapping pins

anthony wrote:

There are no vsa100 chips with support only 3.3v and/or 2x mode. All of them are support 1.5v/4x mode and 3.3v/2x mode at the same time.

Good to know.

anthony wrote:

Configuration done thru strapping pins

I'm not familiar with the expression "strapping pins".

This particular card has only worked with AGP 2x set in the BIOS.
It sounds like a PCB revision problem to me. - As others have suggested.
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Might be worth a try - my soldering skills are more then enough for the job, I have a hot air SMD rework station and the paste required to solder said resistor on - what I need to find is a tiny 4.7k smd resistor, and that shouldn't be very hard.

On the 3DFX agp 4x version R97 is indeed bridged by a resistor: http://hw-museum.cz/data/vga/pic/big/3dfx_Voo … rev._3900_F.jpg Pic isn't large enough to read the value, but it could be a 4.7k.

I don't think R97 on reference 3dfx V4 is the same one as on PowerColor. Its position on the PCB is different and I believe it is not AGP related.

Anyway, I took some photos of that area, maybe it will help you.

it will thanks. On your card there seems to be a 85x resistor soldered there - that would be 75Ω. 85B is for 7.5kΩ

Please read the warning at the bottom of this page:
http://www.falconfly.de/identify-3dfx.htm

it warns about the wrong voltage too.

I did. We were discussing how to mod the card to accept 1.5v signaling.

After sorting out my KT333 GA-7VRXP rig I stuck the voodoo 4 in and did some bencheies :

16bit 640x480 - score is DOUBLE what my Voodoo 2 SLi setup scores with an Athlon64 3800+ in the same conditions 😜

16bit 1024x768 - score is... quite a bit higher then my Voodoo 3 3500TV..

32bit 1024x768 - about as fast as a geforce 2 MX

Played a little Quake 3 arena too - set res to 1280x1024, 16 bit color, bilinear filtering, lighting: Lightmap, Texture quality: default and Geometric Detail: high - it gets 38.6 FPS in demo001