There are some Sapphire Rapids ES floating on Taobao and ebay, does anybody tested them?
yes,
give me QDF and i can check.
if you want to buy one, take QYnn, better higher second letter than X, after Z comes '0'
QVnn, QWnn, QXnn are to old and need to work Test/Debug BIOS.
if you want to buy motherboard for test, avoid supermicro, X13 uses RoT mechanism, no BIOS modd.
gigabyte is best. Tyan/ASRock C741 boards lack microcode D0.
SPR-WS need W790 chipset(DMI4x8)
SPR-SP need C741 chipset(DMI3x8)
edit:
SPR-SP ES D0 run on ASUS W790 boards.
ASRock W790 WS BIOS includes D0 microcode too, but not tested.