I have searched for a replacement of my 2011 Sandy platform (C8220) for some time and finally found direct upgrade from the Dell:
Dual LGA 2011-3, 16 DDR4 slots, 8 SAS ports, Dual 10Gbe, probably same power cable as C8220/C6220:
$205 Offer accepted (with a riser and heatsinks): 4FNTC DELL...