For Threadripper, all CPUs and motherboards are fully validated for ECC. (AMD requires Threadripper motherboards to implement ECC.) It's only Ryzen where the C

For Threadripper, all CPUs and motherboards are fully validated for ECC. (AMD requires Threadripper motherboards to implement ECC.) It's only Ryzen where the CPUs support ECC, but AMD doesn't require AM4 socket motherboards to implement it. (And you have to verify that a board advertising ECC actually implements ECC and doesn't just accept ECC modules.) I'm in the same situation, looking to get a new workstation and want ECC. Performance-wise, I would be good with a 3900x or 3950x. But PCIe lanes and good IOMMU separation are also requirements for me, so it looks like I have to go Threadripper. I'm disappointed that there's no 16 core Threadripper that has the other benefits of a HEDT platform for people who don't need zillions of cores. The current generation motherboards are also disappointing in that they max out at 4 PCIe slots. Apparently this is because PCIe 4.0 is still rather expensive at the moment.