You can build old Xeon based but only has 40 lane PCIe. For training 8 GPUs how do you push data fast? I’m using 7000 series Epyc for this to get 128 lanes. Have you built this kind of machine? You see good speed with 40 lane? Curious because then I can use old Tyan motherboard which comes in full case with good layout for multi GPU. Epyc based I have to use riser and custom frame which is painful.

New Tyan more costly but great case layout.