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Have you heared... (Read 792 times)
m14radu
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Re: Have you heared...
Reply #15 - 20.07.07 at 06:30:41
 
@outlaw: Why specially a board with a nforce2 chipset ?
It could be done i think also for a VIA K8T800 or Nforce3 chipset, because the AGP specifications are the same..... or im wrong ?
Any ideas about this possibility  ?

Btw., without bios, there are not many chances..better you get another board.

And again, the scores is very very low for such a machine.
I have tryed yesterday my XP-Mobile @2500 with a Voodoo4 and the score is very near to the score from this dude ( about 1900 points )
Br.
Radu.
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outlaw
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Re: Have you heared...
Reply #16 - 20.07.07 at 13:06:47
 
Quote:
@outlaw: Why specially a board with a nforce2 chipset ?
It could be done i think also for a VIA K8T800 or Nforce3 chipset, because the AGP specifications are the same..... or im wrong ?
Any ideas about this possibility  ?

Btw., without bios, there are not many chances..better you get another board.

And again, the scores is very very low for such a machine.
I have tryed yesterday my XP-Mobile @2500 with a Voodoo4 and the score is very near to the score from this dude ( about 1900 points )
Br.
Radu.


Yes, Nforce3, kt800pro or kt880 would be candidates for the project but I mention NForce2 since that is my only spare board I can use that wont bother me if it gets burned to ashes.

s for the bios, I m looking for a machine with an interface (like usb or serial ir something) that would support programming bios chips. Found a few on ebay but they all support the old-school bios chips not the tiny ones used nowdays.
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m14radu
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Re: Have you heared...
Reply #17 - 20.07.07 at 14:14:24
 
Take a look here, whats happend with an intel board:

http://www.3dfxzone.it/enboard/topic.asp?TOPIC_ID=5095&whichpage=2

Icefire tried this mod...

So, take care !

I have here a K8T800 board, an 3500+ CPU, a Voodoo5 ( my only one ) and also the will to try it. Grin
If something goes wrong, what will be burned ? Motherboard alone, or also the voodoo card.

Regards.
Radu.
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Re: Have you heared...
Reply #18 - 20.07.07 at 14:26:19
 
It is well known 875/865 had weak agp buses when it comes to modding. I remember people raising the vddq in order to link it with the vtt for memory since mems v.r.s back then didn't follow the rule vtt=1/2vdimm after a certain value so you ended up with 3.3v or more for vdimm but vtt was stuck at values of ~1.45v. Most of whom I knew that linked the vddq with vtt at values above 1.65v ended up with a dead board. On the other hand socket A boards and NForce 2 ones especially where a bit more tollerant in voltage modding (8RDA, NF7-s, 7njs, A7n8x)....especially the weak asus could last endless mods...had a rev. without the known vdimm shut down protect system above 3.15v and back then (with vtt following as it should) I was able to get stable (no drops under load) 3.4v at my winbond bh-5 whilst vddq was at 2.1v and vcore at 2.05v. That is why the amd platform might be a better platform to experiment on.

p.s. btw don't forget that via has the vlink circuit no the agp bus. Don't know how it will react if it receives 3.3v out of nowhere Smiley. Had an asus 939 kt800pro board that stuck oc at ~280Mhz (no 3d above) and when I tried to raise the vddq with a newly found mod in extremesystems....the board died....not on modding....on vddq raising.
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« Last Edit: 20.07.07 at 14:34:56 by outlaw »  

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m14radu
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Re: Have you heared...
Reply #19 - 20.07.07 at 15:07:36
 
Well, the sistem should boot fine with the from bios increased voltage ( 1.75 Volt ).
I will be happy if it will start at the default voltage... i don't want to burnd something..especialy my voodoo card  Shocked
Afterthat if it's instable at this voltage, i think about rising the voltage tot 3.3V.

If the card must just be inserted in the AGP Slot, then the moding is only to remove agp plastic restricts. So my question is why the Voodoo5 5500 AGP4x prototipes ( which are fitting in the Slot without to be cut ) didn't work in a AGP4x/8X Mobo ?
@ Voodoo5 5500 AGP4x owners: did somebody try to start such a card in a Nforce2 Mobo ?
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« Last Edit: 21.07.07 at 03:00:59 by m14radu »  
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Re: Have you heared...
Reply #20 - 22.07.07 at 08:37:08
 
Well, so far i made another experiment !

In order to force the Voodoo5 card to operate with 1.5 Volts ( AGP 4x ) i connect the AGP A2 pin to ground.
In this way, the Mobo should detect the card as a AGP4x card and supply it with 1.5Volts.
Unfortunately the system did not start ! ( Epox Post error message is 2d ) ... My Board Epox 8K5A2 did not have the possiblity to change the AGP Voltage in order to go over the 1.65 Volts...
What i expect with this ?
I was sure that with this both modification ( A2 grounded and AGP Voltage increasing ) the card will start in an Universal AGP Slot ( AGP1x,2x,4x ) and ...very important ... i can select the AGP4x in BIOS !
If this could be possible, then this will be for me a good evidence that the card can be pluged in a AGP4x/8x Slot without problems !
Fell free to comment my experiment !

P.S. Nor the voodoo card and Mobo were damaged ...
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Re: Have you heared...
Reply #21 - 22.07.07 at 09:28:37
 
Quote:
Well, so far i made another experiment !

In order to force the Voodoo5 card to operate with 1.5 Volts ( AGP 4x ) i connect the AGP A2 pin to ground.
In this way, the Mobo should detect the card as a AGP4x card and supply it with 1.5Volts.
Unfortunately the system did not start ! ( Epox Post error message is 2d ) ... My Board Epox 8K5A2 did not have the possiblity to change the AGP Voltage in order to go over the 1.65 Volts...
What i expect with this ?
I was sure that with this both modification ( A2 grounded and AGP Voltage increasing ) the card will start in an Universal AGP Slot ( AGP1x,2x,4x ) and ...very important ... i can select the AGP4x in BIOS !
If this could be possible, then this will be for me a good evidence that the card can be pluged in a AGP4x/8x Slot without problems !
Fell free to comment my experiment !

P.S. Nor the voodoo card and Mobo were damaged ...


Nice try, Radu, but, do not get upset at me, nice but futile...
First, a statement that there is no doubt about its truth: it does not matter if you are able to select 4x or even 8x mode for AGP in BIOS. A Voodoo5 will allways default to PCI66 mode. It is just the way those cards were built.
Now... the state of the A2 pin is questioned almost only into AGP universal 2.0 slot powered mainboards. With very few exceptions, the 1.5V-only boards assume that only 1.5V/0.8V video cards could be inserted into the keyed slot and after all, have no possibility to provide 3.3V signaling if such a card would ever be fitted into so there is no point to check for a grounded A2 pin for AGP 8x motherboards.
With AGP universal 2.0 mainboards the TYPEDET value is examined at power-up and the video card do negociate with the motherboard's chipset for a common compatible signaling mode. In your special case, in this pre-boot sequence the 8k5a2 MB finds that a 1.5V video card in inserted (due to the state of the modded TYPEDET) and selects 1.5V signaling to use to comunicate to the GPU(s). Allthough VSA100 is capable of this mode, on the Voodoo5 PCB it is hardwired for 3.3V only and the 1.5V signals sent by the MB are not able to cross the treshhold required by the GPU. Therefor the mainboard concludes that it is not able to "talk" to the video card and returns a 2Dh error code, as expected.
Again, friends, do not get confused about the AGP mode and the signaling value apparent link. A video card if built compatible, should be able to opperate correctly in AGP 2x mode with 1.5V signaling with no problem. the trouble is the other way: it should not be possible for a video card to run at AGP 4x or 8X mode with 3.3V signaling (ofcourse, we do not care about that since our Voodoo5 cards will default to PCI66 mode anyway, but I was just stating the facts).
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m14radu
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Re: Have you heared...
Reply #22 - 22.07.07 at 12:19:41
 
Hi Komponent,

I'm glad that you are back in "3dfx" modding bussines !
Thanks for your feedback, and as usual some remarks :

In my experience i conected only the AGP Pin A2 to ground  - that tells the Mobo to supply the card with 1.5Volts. But the GPU continues to work at 3.3Volts !
I must connect the TYPEDET Pin from both VSA100 also to ground in order to tell the GPU's to use 1.5 Volts signals.
This step was not made because i was not able to find this GPU's Pin's on the card and i tried to avoid any risk The Foto that you posted is for the Voodoo4 ! Can u post pls a picture with the exact location ( better the soldering point ) of this pins at voodoo5 ?

When the AGP Voltage will be increased over 1.5volts ( i.e. 1.8 Volts ), then it will cross over the treshhold required by the GPU - so that the card will start working with 1.5V  8)
Do u agreed with this ?

Thanks for your 3dfx "technical " support !  Wink

Radu.





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Re: Have you heared...
Reply #23 - 22.07.07 at 13:02:34
 
Quote:
Hi Komponent,

I'm glad that you are back in "3dfx" modding bussines !
Thanks for your feedback, and as usual some remarks :

In my experience i conected only the AGP Pin A2 to ground  - that tells the Mobo to supply the card with 1.5Volts. But the GPU continues to work at 3.3Volts !
I must connect the TYPEDET Pin from both VSA100 also to ground in order to tell the GPU's to use 1.5 Volts signals.
This step was not made because i was not able to find this GPU's Pin's on the card and i tried to avoid any risk The Foto that you posted is for the Voodoo4 ! Can u post pls a picture with the exact location ( better the soldering point ) of this pins at voodoo5 ?



Quote:
I simply had no spare time anymore to continue the project with a Voodoo5, sorry...


... but I will try... maybe soon...

Radu, you know from the e-mails that I sent you in the past what is my oppinion. If you strap the GPU's TYPEDET pin you will have to provide a treshold for the 1.5V signaling.
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m14radu
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Re: Have you heared...
Reply #24 - 30.09.07 at 21:00:55
 
Te italian dude "ciacara" modified an Asrock 4Core Dual-SAta2 board, in order to take the voodoo5 !
Grin

His courage is impressive !

the link remain the same:

http://www.forumzone.it/topic.asp?TOPIC_ID=22932&FORUM_ID=40&CAT_ID=25&Topic_Tit...
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