The N305-powered CWWK firewall/router I picked up back in October off Amazon when it was on sale for $286 (arrived in 5 days) seems to run nice and cool averaging 32C for the CPU and 44C for the 1TB NVME drive. 32GB RAM. No external fans or anything like that, the only thing I did to assist in cooling was get 4 cheap laptop riser "feet" pedestals that raise the whole thing about an inch off the surface to allow for better airflow under the case. It barely feels warm to the touch, even when running backups to the NAS server.
With OPNsense running as a VM as well as a second VM for Home Assistant *and* a CT running 17 docker containers, it idles around 5% CPU, bursting up to 10% when it gets busy, and 30% when Proxmox is backing up the 2 VMs and CT to my NAS every night via Proxmox Backup Server running as a VM on the NAS itself.
WAN port is plugged into ATT fiber 2.5GB/5GB port, LAN port into a 1GB Unifi switch, PC port plugged into the Intel 2.5Gb PCIe NIC on my PC, and 4th port is plugged into the Unifi switch which is how I manage Proxmox on it.
The WAN and LAN ports are passed straight through to the OPNsense VM itself.
Solid as a rock so far.
I have an older ~7 year-old i7-4790K PC running 4 monitors hooked up to a GTX 980ti hybrid video card, 10-port Unifi switch (fully populated), tiny UNRAID server on an ASrock tiny PC w/4 drives, ASUStor 6604 w/4 spinning rust drives, the ATT fiber modem, and a 5-port Unifi mini switch powered by POE from the 10-port switch as well as two Raspberry Pi 4s and a tiny cube wifi-only micro-PC for retro-gaming. PC pulls ~190W and the rest is ~102W. When I turn the monitors off at night when I go to bed, PC power usage drops by ~100W.
About the last thing I need to do with my home network setup is to upgrade that 10port Unifi 1GB switch to a newer 10-port 2.5GB Unifi switch so I can finally take advantage of the 2.5GB ports on the ASUStor NAS and then everything put the UNRAID, PIs, and Unifi Mini will be running at 2.5Gbps, including the ATT Fiber connection which is 1Gbps itself. Thanks to the heavy fiber ISP competition in my area due to Google Fiber rolling out here many years ago forcing all the other ISPs to also go fiber or go out of business it's only costing me $40/mo for 1Gbps fiber.
This "network upgrade" has been a long time coming in the planning and execution phases.
ATT was lazy and ran the fiber hookup through the laundry rooms in all the apartments here in my complex which required me to run a 30' fiber patch cable from the box itself to the fiber GPON router (in passthru mode of course) so I could get that moved to my network area and on the UPS there. I tested it and the router itself under heavy load draws about 12W. Not too bad but would be nicer if I could get my own smaller fiber GPON device and ditch that stupid giant white box of an eyesore.
UNRAID used to handle most of my containers, now it's only home to my PBS VM and a couple of other containers to spread the load out.
A lot of the VMs I used to run on the ASUStor itself wound up getting containerized - or rebuilt as a new VM in the case of Home Assistant - and now run on the CWWK N305 box itself since my firewall will always be running.
Electric bill is about $75/mo.
And that's how I'm running my particular 4-port CWWK N305 device.

