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OK, sorry, I'm not native speaker and that phrase was too simple. By "Good ASPM support" I mean:
1. Firmware/bios is tuned so power saving modes are working properly with all hardware components integrated onboard
2. Enabling ASPM causes significant reduction of power consumption in idle

There are not many companies who take power saving seriously but Hardkernel is one of the exceptions.
You can google several H3/H4-related fine-tuned builds online which can go down to around 3-5 watts idle (in Linux):
https://www.hardkernel.com/shop/odroid-h4/
https://forums.unraid.net/topic/167669-odroid-h4-intel-n97-2x25gbit-4x-sata-1x-m2-ddr5-max-48gb-with-ecc/

I know OPNsense is not based on Linux but Proxmox is. That's why I want to try a build with H4@Proxmox with it's linux drivers.
Maybe it's completely stupid idea, VM-related performance/power penalty will be too high and I end-up with ASPM-disabled physical server installation like most of you recommend... but I'd like to try and test :)

Hello, I want to build a new low power OPNsense firewall(as Proxmox VM) and consider Odroid H4 + Netcard2(4x i226).
Is it a good candidate for low idle power consumption (7-8w idle max)?

Odroid H4 has good ASPM support but here I found the warning about Intel i226 related problems with ASPM enabled.
Does the ASPM-enabled problem also affecting virtual OPNsense installations @Proxmox with VTNET virtual adaptors?

Can I use the Netcard board 4-ports for virtual adaptors in proxmox?
Thanks in advance for advice

[EDITED]

Sorry for necroposting.

I am testing OPNsense 25.1.6 on the R4S, and unfortunately, the performance I'm observing is quite poor (~230 Mbps download / ~210 Mbps upload).

EDITED: upgraded to 25.1.8 and installed "os-realtek-re" - unfortunately nothing improved.

Thank you for posting news about current state of NanopiR4.
I bought it because of power efficiency and was hoping for performance improvement after some time but it seems it's getting slower.
Maybe some HW acceleration plugin for ARM CPUs similar to those for Intel/AMD could help to improve the performance...