PCIE L1SS

[Weichen]

Hello,

I came to here after two days' search in HP website and google.

I bought one Z2 G5 SFF, which has CPU i7-10700. I want to plug in one NIC with PCIE L1 sub-states capability, but seems Z2 G5 can't support it. No related options in BIOS (I only found one ASPM option). 

I checked PCIE configuration space. @0x200 L1 Sub-States Extended Capability Header is 0x0000, which means L1 sub-state is not supported.

My understanding is Intel i7-10700 should support L1SS. But how come HP disable it in BIOS? Please correct me if I am wrong.

Also if you know some desktop of HP can support L1SS, please let me know the part number.

Thanks in advance.

Wei

[itsmyname]

Does it make a difference if you enter BIOS SETUP, and "disable" the integrated NIC, to force the motherboard to access the PCIe network-adapter?

[Weichen]

Thanks for replying.

No matter what BIOS setting changes I made, even without the plug-in NIC, I always can't see L1 sub-state info in "lspci -vvv " outputs of PCIE RC. So I think maybe it is disabled in BIOS without any option.