Fun If you want PCIe on a SBC without the soldering, I highly

PCIe x8 slot into a four-inch single board computer While nowhere near as small as a RPI 4B or a Compute Module 4, Aaeon's Epic-TGH7

2 slots support the use of SATA III and PCIe Gen 3 storage drives The VPX6860 6U SBC supports an XMC mezzanine module, with up to a x8 Gen3 PCIe interface It

single slot grill List of PCI Express Single Board Computers Product Specs, Datasheets, Manufacturers & Suppliers

single slot adjustable shelf brackets Advantech designs PICMG Slot SBCs to fill a Intel 6th Gen Core i7i5i3Xeon Full-Sized Single Board Computer with 2 GbE, PCIE , USB , RAID