There are four pre-production (not ES) Epyc 7663p's available. These CPUs present as regular 7663p's and do not differ from their retail counterparts. These are not vendor-locked. Stability tested with y-cruncher.

However:

Throughout my testing, these CPUs have presented a quirk where they may ocassionally upon reboot, hang at POST-code 63 (DXE CPU Initialization). This was replicated on two different ASROCK ROMED8-2T motherboards on bios revision P4.10 , and a H12SSL-i on BIOS revisions 2.3, 2.6a, 2.8, 3.3 . Different BIOS versions regardless of date and microcode patch do not seem to impact these chips' functionality. For clarification, this issue does not happen after the system has successfully completed POST.

After hanging on 63, a CMOS reset & cold-boot has always resolved this issue.

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Feel free to ask if you have any questions,