HP ProDesk 400 G3 and Quad-gigabit NICs

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New Member
May 16, 2023
I am trying to setup a PC-based firewall and I have ran into some sort of a wall (pun intended).

I'm repurposing an old desktop, an HP ProDesk 400 G3 SFF (6th Gen Intel CPU) and adding a quad-port gigabit NIC. I have two quad-port NICs and both of them seems to be, one way or another, not supported.

  • HPE NC375T (NetXen NX3031) - The PC boots up fine but the NIC doesn't show up inside the firewall or in Debian (ie. 'ifconfig' only lists the embedded gigabit port but not the 4 ports on the NIC)
  • HPE 331T (Broadcom BCM5719) - When installed, the PC makes 3 long beeps and 2 short beeps immediately after power-on. All troubleshooting literature points to a RAM issue, but the error goes away if I remove the NIC.
I have a 3rd card, which is a dual-gigabit, Intel-based NIC and it works fine with the firewall (Intel = no surprises, I guess).

Would it be safe to say that the ProDesk 400 G3 doesn't support these cards at the hardware level? Granted that these are server NICs, I have had no problems with them on any 3rd party PCs that uses off-the-shelf computer parts, so I was almost certain it should work on the ProDesk.

Is this just HP being HP... or is it an actual limitation of the PC's chipset?