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Just curious, whats the advantage of a Connectx6 lx over Connectx4 lx ?

You won't see heat issues with 2.5 or 5gb cards. They run quite cool.

If you need a dual port card, consider this. https://www.amazon.com/Syba-Gigabit-Ethernet-Express-Controller/dp/B07XJ8CMQX

That would work fine, but its more money than you really need to spend for a Realtek. Same card, half the price. https://www.amazon.com/GLOTRENDS-Ethernet-RTL8125BG-PCI-Express-Compatible/dp/B0BLN82WQ4

The Intel I-225 and I-226 are 2.5gb capable cards. Early revisions of them had nasty issues though, so make sure to get at least a rev 3 card. If you want a data center type card, the X710 should do 2.5gb.

I've never used them, but I know they're a more obscure card and fairly power hungry. If I was going to use a data center grade card, I'd go with either a Mellanox 4x LX, or one of the newer Intel's. Regarding heat production, that's one of the reasons I suggest Realtek for your needs. They're...

You should be fine on PCI-express bandwidth. Regarding the performance of the Realtek cards, there's been plenty of recent reports of them performing just fine as long as current drivers are used. The latest Realtek cards are also very power efficient as well.

or if you don't mind spending just a few bucks more, here's a 5gb card. https://www.amazon.com/RTL8126-Network-5GBase-T-Ethernet-Compatible/dp/B0G5X3DWTP

https://www.amazon.com/GLOTRENDS-Ethernet-RTL8125BG-PCI-Express-Compatible/dp/B0BLN82WQ4

realtek 8125 would be a fine choice, just make sure you're using the latest drivers. You don't mention what part of the world you're in, but if you're in the US, you can get the 8125's from Amazon for well under $20.

To answer your question, here's some testing I did a few months back. https://forums.servethehome.com/index.php?threads/realtek-10-gbe-usb-adapters-might-be-on-the-way.47683/page-6#post-490387

There's a big thread on the various Realtek 10gb NIC's on the market here. https://forums.servethehome.com/index.php?threads/realtek-10-gbe-usb-adapters-might-be-on-the-way.47683/ My personal observations - They work fine IF you have the latest drivers installed. In terms of Linux, that means...

Realtek has not written drivers for the newer (non Intel) macs.

Newest they got is 4.33.3.1f

I'd order from Alibaba, but the import fee's are huge. On Aliexpress I don't get hit with the import fee's. I just need to wait a bit until there's more sellers on Aliexpress.

I recently got in a RTL8127, the 1x pcie 4 variant. I tested it in an AMD 9700X system with an ASUS X870 tuf gaming motherboard, newest bios. I used the bottom slot (pcie 4.0 4x) for testing. The test system is connected to an unmanaged HiSource switch (4 2.5gb ports, 2 SFP+ ports) that is...

in theory yes, but you never know if HP does something goofy in their bios that will cause an issue. Keep in mind Supermicro just buys their network cards from Broadcom or Intel or Mellanox and slaps their name on it. What model Supermicro cards are you looking at ?

do you need 32bit or 64bit ?

Which firmware are you looking for? I can grab it off the linked site and toss in on my web server for you.

Just curious, are you running the newest firmware on your mellanox cards ?