3 Port Firewire 800 1394b+a PCIe Card Adapter Apple Mac Pro 1,1-5,1 7,1 *Big Sur | eBay
PCI-e Audio Interfaces for PC and older Mac. High performance super low latency. ADK Pro Audio | 423-254-0492 | This is the Pro Audio gear and Digital Audio Workstation you've been looking
Digigram VX222v2 PCI Audio Card VB153100202 B&H Photo Video
StarTech.com 7.1 Channel Sound Card - PCI Express - 24-bit - 192KHz - SPDIF Digital Optical and 3.5mm Analog Audio (PEXSOUND7CH)