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Comment Re:Not a 486 thing, but... (Score 1) 123

Again, it's about power saving. Idle 1000BASE-T draws noticeably more power than idle 100BASE-TX (IIRC the drop from 100BASE-TX to 10BASE-T is not as significant). There are Energy Star ratings and EU rules about how much power an "off" and "standby" device can draw, so dropping to a lower NIC speed helps reach those levels.

There was a proposal for a "low power idle" mode extension of 1000BASE-T, not sure if that went anywhere or got implemented.

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