Finali found time to migrate from my old workstation (Dell r730XD 24 SFF, 4x U. 2 NVME) to bit newer Dell r7920 (Yes, rack, not tower).

Why?

1: 25gbit NIC.

2: much more airflow.

3: NVME boot.

What I did:

Remove the front 3.5 caddys and backplane, remove corresponding wires from onboard SATA controller .

Cut and file air shroud to fit GPU.

Cut and file CPU heatsink to fit GPU.

Power GPU from 2 sources: rizer 1 power and riser2 power.

Install OS on Intel P4800x SSD. (Yes, Finally, Optane as an OS boot device).

Install 1100W power supply, because it comes with 1600W PS but on a regular 120 receptacle it gives only 800W.

Enjoy!

Next steps: setup direct link to NAS (25 gbit, RDMA, ISCI).

Figure out pci ex bifurcation. System can see only one of U. 2 ssd connected thru 16xPCI to 4 U. 2 SSD adapter.