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I finally figured this out this week and was able to validate it, I hope this helps someone in the future. The Qotom box doesn't supply the correct voltages, and the distance of the DAC cable was causing my issue. I was using a 1-meter DAC cable from 10Gtek and that caused the issue. Once I tested with a 0.3-meter DAC cable my speeds were normal on 1Gb. I ordered a 1 meter AOC (Active) DAC cable and I've installed the router today and so far it's stable. Time will tell, though from testing on multiple ports and multiple reboots, it's been stable. With the unstable setup it would have already failed.

This thread saved me: https://forums.servethehome.com/index.php?threads/qotom-denverton-fanless-system-with-4-sfp.41331/page-14#post-419760

Opnsense to function with an X553 chipset

I would think that the support for the X553 chipset should be good, since the Negate 6100 uses the same CPU and the two SFP+ ports seem to also use the x553 chip.

To what are you connecting the SFP+ port, a switch or a client? What SFP+ transceivers are you using? What is the link speed for the link between the router and the switch/client?

I'm using a DAC cable and connecting to a USW (UniFi) aggregation switch and a UniFi 1Gb GBIC to validate on the end.

I previously tested this with the USW doing 10Gb to my multi-gig UniFi switch and my results were the same.

The client and switch link speed is 1Gb. The router and ONT is 2.5Gb.

I've been battling Opnsense for months, trying to replace my old PFSense router with this hardware https://www.aliexpress.us/item/3256805995358102.html

I've seemingly narrowed down my issue to the X553 Chipset running the 10Gb ports. I'm only able to get 1000/14 throughput on this chipset. I've been able to verify this by installing speedtest-cli on Opnsense and verifying roughly 1000/1000 speeds on the WAN interface with the I-226V Chipset. I've verified the X553 chipset is fully supported by FreeBSD 14, which OpnSense is based on.

All of this is on a default configuration (Live ISO and install) with ASPM off and TSO, LRO turned off.

I'm wondering if anyone has been successful at getting Opnsense to function with an X553 chipset or if my hardware purchase needs to become e-waste?