X10SRL-F Motherboard...
I went with the Supermicro X10SRL-F because it gives me two x16 slots, which is the key requirement for dual GPUs in this build. It’s very similar to what I was already running, but the PCIe layout and lane usage make it a better fit when you’re stacking GPUs plus an HBA and a 10GbE NIC.
You'll be taken to Ebay to complete your purchase.