Not able to find much info on these but found some hints that suggest these are made by Toshiba.
COO-TW 1030556-03 ASSY , RAZORBACK PCIE X 8 , 4096GB ETLC , 2048GB SCREENED 3D BICS G3 ODP , 1.8V , TOSHIBA , REV B1 CONTROL
Assy, Razorback Pcie X 8, 4096gb Etlc, 0.3.14 Canary, 2048gb Screened...