Threadripper already accomplished all of this years ago. My TR2970WX has 24 cores/48 threads, 48 PCI-E lanes, and it supports ECC and non-ECC RAM. My AsRock Rack board has BMC support as well.

The Threadripper series was the perfect workstation CPU. I’ve had mine for a few years and it can handle anything I throw at it, it can easily transcode 2-3 4K videos while doing multiple other things.

It wasn’t cheap though, it was like $650 on sale, originally like a grand or so.