HEX S (2025) sfp datarate issue

RouterOS General
1

Hi everyone,

I’m experiencing an issue with a 2.5GbE SFP module in my MikroTik hEX S (2025). The module uses a Realtek chip and I’m seeing some strange behavior in terms of throughput:

  • Download: Achieves over 1gbps, as expected for a 2.5GbE module.
  • Upload: Capped at 100mbps, which is significantly lower than expected.

I’ve tested multiple cables to rule out any cable-related issues but the problem persists across all tests. My suspicion is that the Realtek chip in the SFP module may not be fully supported by RouterOS?And thats what is leading to this upload speed limitation?

Has anyone else encountered similar behavior with a Realtek-based 2.5GbE SFP module on the hEX S or other MikroTik devices? If so, do you have any insights or workarounds? Additionally, does anyone know if/when MikroTik plans to add support for this chipset in RouterOS?

Any information or experiences you can share would be greatly appreciated!

Thanks
Thomas

2

There’s a general problem with performance of ether1 (on hEX refresh and hEX S 2025) and SFP+ (on hEX S 2025) due to how these ports are internally handled (directly by CPU unlike other ports which are handled by switch chip). Search the forum, you’ll find the relevant thread (it started with ether1 issues on hEX refresh) it applies to your case as well.

3

It was even commented 1h ago: Hex refresh download speed - #29 by Hiutale

4

I don’t own either of the devices but saw multiple threads about this. However, at least some report it’s working fine: https://www.reddit.com/r/mikrotik/comments/1ldf4rj/hex_s_2025_e60iugs_simple_25g_nat_throughput_test/