3dfx Archive - Voodoo5 5500 mod from 3.3v only to 1.5v only AGP4x

Komponent

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Voodoo5 5500 mod from 3.3v only to 1.5v only AGP4x
30.10.13 at 20:46:56

I had some free time this evening, so I thought I'd look into a mod I was asked for: Voodoo5 5500 AGP working with 1.5v signaling (the so called AGP4x).
In the picture you have the instructions to replicate what I've come up with:

I only have available a motherboard with Universal AGP 2.0, but I measured the working voltage and it was 1.5v. Tested under Windows ME for a number of 3DMark2001SE runs, Fastest FSAA setting, no problems.

TESTERS NEEDED!
If some of you lads with AGP 4x only motherboards could please copy this mod on a Voodoo5 card and test for compatibility would be great. There are 3 ways to make possible the insertion of a Voodoo5 into a 4x keyed AGP slot: use an universal AGP riser, remove the notch from the motherboard slot or cut a key into the Voodoo5's PCB.
Warning: this mod converts the Voodoo5 AGP from 3.3v only operation to 1.5v signaling only. I will probably refine it over the weekend to include jumpers to select between the two modes.

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« Last Edit: 30.10.13 at 20:58:17 by Komponent »

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Loeschzwerg Senior Member Offline AAlchemy PSU maker :-) Posts: 396 Germany -> Bavaria -> Augsburg Gender:	Re: Voodoo5 5500 mod from 3.3v only to 1.5v only AGP4x Reply #1 - 30.10.13 at 22:09:21 Ok, I understand the pin C1 and AGP A2 modification, that's what I did too. (didn't work) But why connect B16 directly to AGP B7? It's base clock signal (66MHz) I know, but what's the deal with it. Enlighten me please
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Komponent Senior Member Offline 3dfx modder Posts: 282	Re: Voodoo5 5500 mod from 3.3v only to 1.5v only AGP4x Reply #2 - 31.10.13 at 04:38:08 Rerouting to bypass the AND gate IC that does not work with 1.5v.
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Loeschzwerg Senior Member Offline AAlchemy PSU maker :-) Posts: 396 Germany -> Bavaria -> Augsburg Gender:	Re: Voodoo5 5500 mod from 3.3v only to 1.5v only AGP4x Reply #3 - 31.10.13 at 06:52:27 Ah ok, makes sense. Thanks Still wondering what this gate is meant for. Many early V5 prototypes don't have it. Test following this afternoon when I'm home from work.
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m14radu God Member Offline Take your chance ! Posts: 555 Timisoara, Romania Gender:	Re: Voodoo5 5500 mod from 3.3v only to 1.5v only AGP4x Reply #4 - 31.10.13 at 08:15:16 You did it Komponent ! Congratulation...seems to be to easy after so many attempts ...
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osckhar God Member Offline www.3Dfx.es Posts: 812 SPAIN Gender:	Re: Voodoo5 5500 mod from 3.3v only to 1.5v only AGP4x Reply #5 - 31.10.13 at 09:18:32 Amazing komponent! Finally you got it. Not words here.
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EMPEROR Junior Member Offline 3dfx enthusiast Posts: 67 Germany Gender:	Re: Voodoo5 5500 mod from 3.3v only to 1.5v only AGP4x Reply #6 - 31.10.13 at 10:52:35 If this mod is really working, this is one of the best mods ever done! Great job komponent!!!
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osckhar God Member Offline www.3Dfx.es Posts: 812 SPAIN Gender:	Re: Voodoo5 5500 mod from 3.3v only to 1.5v only AGP4x Reply #7 - 31.10.13 at 16:38:29 MOD done. Just tested kt333 board. Card boots up Vagp 1.5. Now testing 3Dmark test. System is 100% stable. I would need an agp riser to test it in a pure agp4x. Great job again komponent. Regards, Oscar.
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m14radu God Member Offline Take your chance ! Posts: 555 Timisoara, Romania Gender:	Re: Voodoo5 5500 mod from 3.3v only to 1.5v only AGP4x Reply #8 - 31.10.13 at 16:43:25
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goriath

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Re: Voodoo5 5500 mod from 3.3v only to 1.5v only AGP4x
Reply #9 - 31.10.13 at 17:31:52

osckhar wrote on 31.10.13 at 16:38:29:

MOD done. Just tested kt333 board. Card boots up Vagp 1.5. Now testing 3Dmark test. System is 100% stable.

I would need an agp riser to test it in a pure agp4x.

Great job again komponent.

Regards,
Oscar.

Try to add a jumper on the A2-C1 track.
~~After I put a jumper there it's not working anymore~~.
Reinstalled the 4.7KOhm resistor in R22 and it's working again.

BTW this mod need two jumpers/microswitches to be reversible, one in the R46 the other on the C1-GND track.

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« Last Edit: 31.10.13 at 18:16:10 by goriath »

OLD SCHOOL: Because it was done right the first time

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osckhar God Member Offline www.3Dfx.es Posts: 812 SPAIN Gender:	Re: Voodoo5 5500 mod from 3.3v only to 1.5v only AGP4x Reply #10 - 31.10.13 at 18:26:22 @goriath, Once you connected A2toC1 card stop to work? Now I have connected A2toGND Regards, Oscar.
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Komponent Senior Member Offline 3dfx modder Posts: 282	Re: Voodoo5 5500 mod from 3.3v only to 1.5v only AGP4x Reply #11 - 31.10.13 at 18:33:02 @goriath Sorry, I don't understand. Let aside jumpers for now. Follow exactly my instructions. It really should work.
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Loeschzwerg Senior Member Offline AAlchemy PSU maker :-) Posts: 396 Germany -> Bavaria -> Augsburg Gender:	Re: Voodoo5 5500 mod from 3.3v only to 1.5v only AGP4x Reply #12 - 31.10.13 at 19:12:39 Can confirm card is booting on AGP 2.0 board with 4x/8x notched slot. System is an Asus A8V Deluxe. I'm using an AGP riser. Card is NOT running stable at the moment, the system freezes on the second/third 3DMark99 test. Going to check the AGP connection, riser cards are always a bit wobbly.
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Loeschzwerg Senior Member Offline AAlchemy PSU maker :-) Posts: 396 Germany -> Bavaria -> Augsburg Gender:	Re: Voodoo5 5500 mod from 3.3v only to 1.5v only AGP4x Reply #13 - 01.11.13 at 21:12:57 Couldn't get the card running stable in 3d applications. Flashed the bios to 1.12 but the card didn't boot anymore after this... Unfortunately I can't get it flashed back No matter what bios, what tool version and what system I use. So I'm going to undo the mod and try to flash it again.
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Komponent

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Re: Voodoo5 5500 mod from 3.3v only to 1.5v only AGP4x
Reply #14 - 02.11.13 at 14:14:39

Video: http://youtu.be/73kUXgbTcG4

EDIT: VERY IMPORTANT UPDATE

For stability improvement unsolder the marked pin (pin 14 of the IC) and lift it off the pad to disable the IC (or unsolder and remove the IC).

For Windows operation compatibility improvement go to Device Manager, System Devices and locate an entry that should read "CPU to AGP controller". Select it and choose to Update Driver. Use "PCI standard PCI-to-PCI bridge" driver for it. That will disable advanced AGP features.

It is highly recommended that you apply both this updates! If you tried the mod before ad encountered problems in operation, do the above 2 things and give it another spin.

I need your feedback if you want me to further refine the mod.
Over the years I've come up with a sh1t load of world premiere mods and I've received little credit or support (I wonder why I'm still doing it?), but at least feedback is of the essence.

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« Last Edit: 02.11.13 at 15:54:48 by Komponent »

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