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Thunderbolt 3 speeds on M2 MBA
source link: https://forums.macrumors.com/threads/thunderbolt-3-speeds-on-m2-mba.2375750/
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Thunderbolt 3 speeds on M2 MBA
Mar 17, 2009
1,546
Wash, DC Metro
So, I know the spec for TB3 of 40G max with guaranteed minimum 16G and TB4 supports 32GB minimum. I also know that TB3 reduces speed over 1m to 20GB max. Is this a cable restriction, or is the port "smart enough to know the distance. For example, if I use a 2m TB4 cable, on a MBA TB3 port, will I get 40G or 20G?
I was not able to find any clear information on this.
I was not able to find any clear information on this.
Reactions:
EzisAA
The M2 MacBook Air can use Thunderbolt 3 data at 32 GB/s. This works on a short cable of around 0.5 m but longer cables need to have active electronics. Apple sells a $160 3 m cable that will give you all 32 GB/s of data. Longer cables that do not have active electronics are limited to 20 GB/s though I don't know how that breaks down for just data.So, I know the spec for TB3 of 40G max with guaranteed minimum 16G and TB4 supports 32GB minimum. I also know that TB3 reduces speed over 1m to 20GB max. Is this a cable restriction, or is the port "smart enough to know the distance. For example, if I use a 2m TB4 cable, on a MBA TB3 port, will I get 40G or 20G?
I was not able to find any clear information on this.
ilikewhey
macrumors 68030
May 14, 2014
2,961
3,878
nyc upper east
its a cable restriction, thats why anything longer than the standard tb3 and tb4 cost an arm and a leg. i have the apple 1.8m tb4 that cost 130 usd, and on occasions where i do large file transfers, i was able to achieve the maximum output of the tb3 transfer rate.
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