VOGONS


First post, by Sphere478

User metadata
Rank l33t
Rank
l33t

Is such a thing possible?🤔

Last edited by Sphere478 on 2021-10-28, 15:47. Edited 1 time in total.

Sphere's PCB projects.
-
Sphere’s socket 5/7 cpu collection.
-
SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod
-
Tyan S1564S to S1564D single to dual processor conversion (also s1563 and s1562)

Reply 1 of 15, by janih

User metadata
Rank Newbie
Rank
Newbie

Like this one? Re: AGP to PCI adapters - any PCB designers here willing to make one?

EDIT: That link was for pci to agp. But I guess pci-express to agp should also be possible because many late agp cards were already pcie designs with bridge chips: https://www.anandtech.com/show/1545

Reply 2 of 15, by Sphere478

User metadata
Rank l33t
Rank
l33t
janih wrote on 2021-10-28, 06:18:

Like this one? Re: AGP to PCI adapters - any PCB designers here willing to make one?

EDIT: That link was for pci to agp. But I guess pci-express to agp should also be possible because many late agp cards were already pcie designs with bridge chips: https://www.anandtech.com/show/1545

https://images.anandtech.com/reviews/video/NV … TAGP/bridge.jpg

Ooo yeah, like with this chip except have it give me a 16x slot on my old motherboard.. 🤔

Sphere's PCB projects.
-
Sphere’s socket 5/7 cpu collection.
-
SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod
-
Tyan S1564S to S1564D single to dual processor conversion (also s1563 and s1562)

Reply 3 of 15, by weedeewee

User metadata
Rank Oldbie
Rank
Oldbie

pretty certain sdz has a working one... though haven't seen a lot of him recently. Must be busy.

Right to repair is fundamental. You own it, you're allowed to fix it.
How To Ask Questions The Smart Way
Do not ask Why !

Reply 4 of 15, by osckhar

User metadata
Rank Newbie
Rank
Newbie

Hello,

I have developed this one adapter AGPtoPCIe but only compatible for VGA 3.3v- specially for 3dfx Cards.

Regards,
Oscar.

Attachments

  • 20210721_195142.jpg
    Filename
    20210721_195142.jpg
    File size
    695.69 KiB
    Views
    492 views
    File comment
    Prototype AGP2PCIe
    File license
    Public domain

I am not a wizard but I do 3Dfx cards reach anew HW Level. Repair & Mods & Collecting. Working in my own 3Dfx Museum Online based on Lab cards since 2001. www.3Dfx.es - Tweeter oscar_barea

Reply 5 of 15, by Doornkaat

User metadata
Rank l33t
Rank
l33t

I believe this thread is about a converter that will allow a PCIe GPU to work on an AGP motherboard.
A converter that will connect into an AGP slot and provide a PCIe slot.
Maybe the OP and title should be changed to be more specific.

Last edited by Doornkaat on 2021-10-28, 09:08. Edited 1 time in total.

Reply 6 of 15, by sdz

User metadata
Rank Member
Rank
Member

I made (GPU-MB) AGP-PCI, AGP-PCIe, PCI-PCIe, adapters. The PCIe ones are x4 and can overclock the PCI/AGP interface. I will open source all of them at some point. I design hardware for a living and this year was a nightmare due to the IC shortages, I Iiterally have no time to work on these at the moment (they are all working, but I need to optimize the BOM and check everything again, as I designed these quite some time ago). They aren't even manufacturable at the moment, some of the ICs used on these adapters are unobtanium since february or so.
As for an adapter than can allow a PCIe video card to work in an AGP MB, it can be done, but personally I don't see the point.

Reply 7 of 15, by The Serpent Rider

User metadata
Rank l33t
Rank
l33t

Is it possible? Yes, Nvidia adapted some AGP cards to PCIe with HSI bridge. GeFofce PCX 5300, GeForce PCX 5750, GeForce PCX 5900, GeForce 6800GT, GeForce 6800 Ultra.
Can you make one today, which can be fully functional AGP? Not really. Not only you need to make AGP-PCIe bridge from scratch, but you also need GPU driver which is aware of such bridge and can translate specific AGP calls to PCIe.

EDIT: Making adapter which will function as PCI 66 MHz is relatively easy though, but performance will drop noticeably in some games.

Last edited by The Serpent Rider on 2021-10-28, 09:18. Edited 2 times in total.

Get up, come on get down with the sickness
Open up your hate, and let it flow into me

Reply 9 of 15, by rmay635703

User metadata
Rank Oldbie
Rank
Oldbie
sdz wrote on 2021-10-28, 09:12:

@The Serpent Rider
You are correct, what can be done today is PCIe GPU to AGP, with no AGP features, basically PCI@66MHz via the AGP connector.

How does it deal with the data path being 64bit on agp?

Reply 10 of 15, by Doornkaat

User metadata
Rank l33t
Rank
l33t
rmay635703 wrote on 2021-10-28, 13:30:
sdz wrote on 2021-10-28, 09:12:

@The Serpent Rider
You are correct, what can be done today is PCIe GPU to AGP, with no AGP features, basically PCI@66MHz via the AGP connector.

How does it deal with the data path being 64bit on agp?

Isn't it 32bit?

Reply 11 of 15, by weedeewee

User metadata
Rank Oldbie
Rank
Oldbie
Doornkaat wrote on 2021-10-28, 14:57:
rmay635703 wrote on 2021-10-28, 13:30:
sdz wrote on 2021-10-28, 09:12:

@The Serpent Rider
You are correct, what can be done today is PCIe GPU to AGP, with no AGP features, basically PCI@66MHz via the AGP connector.

How does it deal with the data path being 64bit on agp?

Isn't it 32bit?

Looking at the pinout I would have to say, It is 32bit.

Right to repair is fundamental. You own it, you're allowed to fix it.
How To Ask Questions The Smart Way
Do not ask Why !

Reply 12 of 15, by Sphere478

User metadata
Rank l33t
Rank
l33t
osckhar wrote on 2021-10-28, 09:00:
Hello, […]
Show full quote

Hello,

I have developed this one adapter AGPtoPCIe but only compatible for VGA 3.3v- specially for 3dfx Cards.

Regards,
Oscar.

I was talking about going the other way.

Sphere's PCB projects.
-
Sphere’s socket 5/7 cpu collection.
-
SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod
-
Tyan S1564S to S1564D single to dual processor conversion (also s1563 and s1562)

Reply 13 of 15, by Sphere478

User metadata
Rank l33t
Rank
l33t
Doornkaat wrote on 2021-10-28, 09:04:

I believe this thread is about a converter that will allow a PCIe GPU to work on an AGP motherboard.
A converter that will connect into an AGP slot and provide a PCIe slot.
Maybe the OP and title should be changed to be more specific.

Yes this, I’ve searched but didn’t find? Any help with link?

Sphere's PCB projects.
-
Sphere’s socket 5/7 cpu collection.
-
SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod
-
Tyan S1564S to S1564D single to dual processor conversion (also s1563 and s1562)

Reply 14 of 15, by weedeewee

User metadata
Rank Oldbie
Rank
Oldbie
sdz wrote on 2021-10-28, 09:12:

@The Serpent Rider
You are correct, what can be done today is PCIe GPU to AGP, with no AGP features, basically PCI@66MHz via the AGP connector.

Did you ever send that AGP-PCI adapter onwards ?

Right to repair is fundamental. You own it, you're allowed to fix it.
How To Ask Questions The Smart Way
Do not ask Why !

Reply 15 of 15, by Doornkaat

User metadata
Rank l33t
Rank
l33t
Sphere478 wrote on 2021-10-28, 15:46:
Doornkaat wrote on 2021-10-28, 09:04:

I believe this thread is about a converter that will allow a PCIe GPU to work on an AGP motherboard.
A converter that will connect into an AGP slot and provide a PCIe slot.
Maybe the OP and title should be changed to be more specific.

Yes this, I’ve searched but didn’t find? Any help with link?

Sorry, but I don't know any. I was just trying to help clear up the confusion.