Warning about RealTek adapters - again!

[Bob.Dig]

they will prefer PCIe 4.0 x1 over PCIe 3.0 x2 (they can do both)

Don't think so, I bet the x4-card will only do PCIe3. But if you had no luck till now, it will not change with these.

[Stormscape]

I've seen the 8127ATF SFP+ NICs and I wonder if they work any better than the 4.0 1x BaseT cards. I've also noticed they're all 4x, so they're presumably PCIe 3.0 only. If they are, putting them in a 1x slot wouldn't get a full 10 gigabits, but it would still be 7.5 gigabits which ehhh... close enough.

[meyergru]

I think that is a misconception. Realtek advertises those AT variants as being either PCIe 4.0 x1 or PCIe 3.0 x2, but that is only to show its capability to support the full needed bandwitdh with PCIe 3.0 mainboards (provided that they have at least 2 free lanes).

Matter-of-fact, the cards will train at the highest speed they can find. That is just how PCIe works.

So, if you put them into a PCIe 4.0-capable system, they will use PCIe 4.0 x1, regardless. he only only you have on a PCIe 4.0-capable system is to limit the slot to PCIe 3.0 only. Givingg the card more lanes is not gonna cut it.

As it turns out, these Realtek adapters are on the edge of the PCIe 4.0 specification and the X570 chipset is known to be finicky as well. You may have better luck with other mainboard chipsets.

[Seimus]

Well,

maybe already obvious but why not to switch OS on the PC? Is there a reason you need to run Windows instead of Linux?

I know its OS independent, but if there is solution to be found or stability to be gained its far more prompt to be on Linux distributions than on Windows these days.

Regards,
S.

[meyergru]

I use apps and games that are only available on Windows. Besides, this is a hardware issue.

[Seimus]

True to that,

What I can tell you from point of Linux and Realtek.

I have a X870 tomahawk Mobo, its a 5G realtek NIC basically its the RTL8126 and I run it on r8126 driver.

Code Select Expand

 
Device-2: Realtek RTL8126 5GbE vendor: Micro-Star MSI driver: r8126
    v: 10.016.00 modules: r8169 pcie: gen: 3 speed: 8 GT/s lanes: 1 port: e000
    bus-ID: 0a:00.0 chip-ID: 10ec:8126 class-ID: 0200
  IF: enp10s0 state: up speed: 1000 Mbps duplex: full mac: <filter>
  Info: services: NetworkManager,systemd-timesyncd

I run it only at 1G, reason is I do not have currently a better switch. But at least on this speed its rock solid, didn't had yet any issues.

Regards,
S.