Intel refused to support ECC outside of the server space
Are you sure about that? or since when?
I had a home PC on ASUS CUV4X-D mobo, wasn't even server grade, ran dual Pentium III 1GHz with 4GB of Registered, ECC PC-133 SDRAM.
Just for the sake of to have dual core home PC during pre-dual core processor era. Ohh the bootdisk was an 18GB SCSI Cheetah X15 plugged onto an Adaptec SCSI AIB, it was a beast system at that time, the sound of the X15 spinning up was a music to my ears. Good moments.
Yes those are server grade parts, but I bought them 2nd hand except the mobo and CPUs which were just consumer grade parts from local shop, I was a student back then.