Tyan S2460 AGP issues \ VOGONS

Tyan S2460 AGP issues

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First post, by Sculan

Posted on 2023-09-10, 11:01

Sculan Offline

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Hi all,

I decided to build a retro PC as follows:

- Tyan S2460
- 2 x Athlon MP 1900+
- 3 x 1 GB DDR ECC Reg

PSU: As I lacked one from that time and 30+ A 5 V PSU are rare I use a Corsair AX1600i + Tyan Adapter (4 Pin additional input in the 20 Pin ATX plug)

My issue now comes from the AGP GPU:

- Asus V8200 GeForce 3 => no issue, one Beep and go
- Hercules 3D Prophet with Geforce GTS or Kyro => no issue, one Beep and go
- Radeon 9800 Pro (4 Pin Molex) => Black Screen on Boot, no Beep
- Geforce 6600 GT (4 Pin Molex) => Black Screen on Boot, no Beep
- Radeon X850 XT Platinum AGP (4 Pin Molex) => Black Screen on Boot, no Beep
- Voodoo 4 4500 PCI => no issue, one Beep and go

As soon as I use a GPU with an external Molex interface I can't get that board to boot.
The GPU Molex I attached to a PSU cable with only the GPU on that one.

Does anyone guide me a little bit, where that issue could arise from?

With the Geforce 3 it is quite point on 2001/2002 but for some old games I need more performance on the GPU side.

Thank you in advance for any help!

Reply 1 of 8, by Sculan

Posted on 2023-11-26, 14:28

Sculan Offline

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Seems I found the issue:

"Native" AGP 4X cards seem to work fine, but any AGP 8X card will make the MoBo fail to boot.

Fastest card accepted was a GeForce4 TI-4600 with AGP 4X...

Reply 2 of 8, by The Serpent Rider

Posted on 2023-11-26, 15:26

The Serpent Rider Offline

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You can try popping PCIe GPU via PCI-to-PCIe adapter.

I must be some kind of standard: the anonymous gangbanger of the 21st century.

Reply 3 of 8, by ElectroSoldier

Posted on 2023-11-26, 15:58

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That slot is 2x/4x not 8x.

Reply 4 of 8, by Sculan

Posted on 2023-11-26, 20:10

Sculan Offline

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Well, I have another board with a 2X/4X AGP Slot, where 8X cards work flawlessly. Shouldn't 8X only be a problem in 1X/2X native slots ? The Tyan S2460 has an AGP 2.0 or do I have by accident just picked 8X "non-Universal 1.5V AGP 3.0" cards?

Does anyone have a spec from Tyan of the S2460 where it states the version of the AGP Slot?

Reply 5 of 8, by Horun

Posted on 2023-11-26, 20:48

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Looking at this from File Date: 2008 / 03 / 03 File Date: https://download.tyan.com/pub/Video/s2460.pdf and
this archive video support: http://web.archive.org/web/20041217233226/htt … ort4.html#s2460
It does list a MSI 4200 and Visiontek 4600. Have to go check the AMD-762 chipset datasheet which says on page 19
"The AMD-762 system controller functions as an AGP target, providing all the signals, buffers, and logic required for full compliance with the Accelerated Graphics Port Interface Specification, Revision 2.0."
that is all I got....

Hate posting a reply and then have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. Stuff: https://archive.org/details/@horun

Reply 6 of 8, by Sculan

Posted on 2023-11-26, 20:54

Sculan Offline

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Thank you very much!

That means, I now just need to find the fastest AGP 8X GPU which has an "Universal 1.5V AGP 3.0" Interface, correct? Then it should work in the AGP 4X 2.0 port... in theory... As I understand the Tyan compatibility list those are native 4X cards?

Edit: Still I don't understand why my Radeon 9800Pro AGP 8X card works in my Asus CUV4X-D which also has AGP 2X/4X interface? Shouldn't it deny to work there also?

Reply 7 of 8, by The Serpent Rider

Posted on 2023-11-26, 22:32

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Radeon 9800 should be already universal AGP 8x, unless you have some late model which used 9800XT PCB.

I must be some kind of standard: the anonymous gangbanger of the 21st century.

Reply 8 of 8, by Horun

Posted on 2023-11-26, 23:26

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I have a BFG 7800 GS OC 8x AGP card and it specifically states "AGP 2.0 spec or higher, 4x/8x compatible". It works ok in my Asus CUSL2-C w/i815 chipset and the specs for the i815 are:
"Supports AGP 2.0 including 4x AGP data transfers - AGP Universal Connector support via dual mode buffers to allow AGP 2.0 3.3V or 1.5V signaling"
The BFG also works fine in my i848 and i865 boards.
My guess is maybe your chipset does not fully support certain 1.5v signaling OR it is a BIOS issue.

Hate posting a reply and then have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. Stuff: https://archive.org/details/@horun

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