In addition, the X550 controller also supports
NBASE-T technology. NBASE-T technology can
increase network speeds of 2.5Gb/s or 5Gb/s using
existing CAT5e/CAT6 cables at lengths up to 100 m.
Intel’s NBASE-T firmware can be upgraded to support
the IEEE 802.3bz specification¹.
文档里找到了这段，应该可以
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NBASE-T speed advertisement (2.5 GbE/5 GbE) is disabled by default in the Sageville NVM.
An NBASE-T enabled driver should be used to link at NBASE-T speeds.
Linux driver version 4.3.9 is currently the only supported software solution for NBASE-T.
For future planned enhancements, contact your Intel representative
更新一下，只有Linux下有可用的驱动
买个4121配光转电不就行了，买x550这种废品有啥用...
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