In April 2017, Project Raptor was cancelled. But 1,200 D33D66 boards had already been fabricated. Most were destroyed. A few hundred "escaped" into scrap bins. Some were even built into complete systems for HP’s own IT department (Marty admitted he had one as his work PC until 2019).
While the Q75 chipset supports 32GB of DDR3, the HP BIOS on the D33D66 is locked. Most users report a (4x 4GB sticks). Use standard desktop DDR3 (1066/1333/1600MHz). Do not use ECC registered server RAM—it will not POST. hp d33d66 motherboard