Neither had I. I was aware of the Parhelia, but had no idea until I grabbed this dual-cpu board that PCI-X GPUs even existed, let alone that the Parhelia was one of them!Love Matrox cards for some reason, never seen that one before.
Did you know there is also a PCIe Parhelia! Yeah a 2003 GPU on PCIe!
There are so many obscure video cards that I'd love to find. Like for example the E&S simFUSION, which was 4 Radeon 9700s on one card! https://www.techpowerup.com/gpu-specs/e-s-simfusion-6000q.b1094, https://vccollection.ru/wp-content/uploads/2018/10/simfusion_6500q-perspective.jpg
Yeah, AGP AND PCI, what a card!