I know these usually have a bottom of the barrel chipset and most certainly not intel but wondered if there's a USB3.0 gigabit adapter that works well with openwrt x86_64 to dip my toes into the openwrt x86 space I installed it on an Atomic Pi (intel atom 2GB ram, etc.) which only has 1 NIC but a USB3.0 port.
I have a couple really old 10/100 usb adapters but neither seem to be picked up by openwrt unless I'm doing something wrong.
The AX88179A is a good choice.
I guess.....not, in this forum post, also I have seen cases from Reddit, people using this dongle in general getting some problems with ASIX88179 (I managed to get one free from colleague so I will see how it goes), right now the better USB one is still the Realtek 8153, or if price difference not that much get a Realtek 8156 (2.5G) then you can reuse on PC or somewhere else later (lots of people using Realtek 8156 with Synology NAS so this has a proven track record)
You need to have some driver installed first, I think x86 image by default doesn't have them, you need to grab information by running 'lsusb" to see what chipset, without doing this no matter what USB dongle you purchase it cannot be used.
Previously the TP-Link TP-UE300 was very popular with the RPi users, might be hard to get hold of today though.
But as @fakemanhk pointed out, you'll need to install the correct packages to get it working.
Now the Realtek 2.5G is quite cheap, so I was just like a no brainer to buy it, and it has a lot better performance.
sure, if your router device would benefit from it, otherwise you're still capped by the LAN side gigabit port.
if we're talking $$$ only, and the price diff is small, why not.
How about the RTL8152?
that's a 100mbit NIC, you already own a couple of those.
Ok, someone in amazon reviews must be mistaken then, they said this is a RTL8152 and it's a gigabit adapter. https://a.co/d/7DyriVQ
The built in usb hub is appealing to me since the atomic pi only has a single usb3.0 port
could be a typo, RTL8153 is gigabit.
What is this, discord? you respond in 30 seconds lol
I'm bored ? 
Do the same rules not apply to openwrt where with opn/pfsense you are to avoid non intel NIC's like the plague?
There is chance that OP might own some of those ASIX 100M, e.g. Apple USB NIC ASIX88772, currently I also have half dozen at home 