It works in my UMC based 486 (Socket 3), but only at a PCI clock frequency of 25, 33 or 40 MHz. It does not like PCI bus at 16 or 20 MHz. At 40 MHz PCI bus clock you need a heatsink on the PCI-AGP bridge too.
However, to operate at 40 MHz the BIOS had to be modified to not switch to 20 MHz during early initialization.
I haven't tried them in newer boards like you mentioned since there are better cards on AGP. I use nVIDIA 5200 there (to have DVI output).

I've had no issues with using my PCI G450 in Socket 7/370 boards. Works perfectly on a VIA Apollo 133T mobo, despite what other people falsely claim in other threads.

Thank you for your replies. Hope you are referring to the Matrox G450 PCI cards specifically from Chinese sellers (Ebay/AliExpress)?

Disruptor wrote on 2025-06-23, 18:46:

At 40 MHz PCI bus clock you need a heatsink on the PCI-AGP bridge too.

Could you please let me know which chip on the video card you are referring to? IC number/identifier preferably?

stealthjoe wrote on 2025-06-24, 10:49:

Disruptor wrote on 2025-06-23, 18:46:

At 40 MHz PCI bus clock you need a heatsink on the PCI-AGP bridge too.

Could you please let me know which chip on the video card you are referring to? IC number/identifier preferably?

That would be the PLX chip below the core.

They should work fine on any socket 5/7 and up. As mentioned they work on some late socket 3 boards as well, but only under DOS as there doesn't seem to be any drivers that work on 486 (did not try with a POD, would probably work).

bertrammatrix wrote on 2025-06-24, 15:42:

They should work fine on any socket 5/7 and up. As mentioned they work on some late socket 3 boards as well, but only under DOS as there doesn't seem to be any drivers that work on 486 (did not try with a POD, would probably work).

That's not true. Windows 2000 drivers work fine. Currently there are no Win 3.1 drivers. (AMD 5x86 @160)
I haven't tried Windows 9x yet.

Disruptor wrote on 2025-06-24, 19:40:

bertrammatrix wrote on 2025-06-24, 15:42:

They should work fine on any socket 5/7 and up. As mentioned they work on some late socket 3 boards as well, but only under DOS as there doesn't seem to be any drivers that work on 486 (did not try with a POD, would probably work).

That's not true. Windows 2000 drivers work fine. Currently there are no Win 3.1 drivers. (AMD 5x86 @160)
I haven't tried Windows 9x yet.

Assuming solid VBE support (which I would expect from Matrox cards from this era), it should run well with the the new vbesvga.drv driver for Windows 3.1.

If any of you run into any issues with this driver on any of the mentioned hardware combinations, please report them to the creator and maintainer, who continues to work on the driver and regularly releases new versions.

digger wrote on 2025-06-24, 22:58:

Assuming solid VBE support (which I would expect from Matrox cards from this era), it should run well with the the new vbesvga.drv driver for Windows 3.1.

If any of you run into any issues with this driver on any of the mentioned hardware combinations, please report them to the creator and maintainer, who continues to work on the driver and regularly releases new versions.

Sorry, but I meant drivers that support the acceleration engine.
I know that I can use any framebuffer driver.
Using the hardware acceleration is important even on a fast 486.

Disruptor wrote on 2025-06-24, 19:40:

bertrammatrix wrote on 2025-06-24, 15:42:

They should work fine on any socket 5/7 and up. As mentioned they work on some late socket 3 boards as well, but only under DOS as there doesn't seem to be any drivers that work on 486 (did not try with a POD, would probably work).

That's not true. Windows 2000 drivers work fine. Currently there are no Win 3.1 drivers. (AMD 5x86 @160)
I haven't tried Windows 9x yet.

Sorry for not being clear on what version of windows - it was windows 98 that I wasn't able to find a working one for.