I've just been Googling about this, but I can't find definitive information (some sites claim things that I'm unsure of). Which is faster for connecting an ethernet cable to a MacBook Pro - a Thunderbolt adapter or a USB 3.0 adapter? I've seen some claims that Thunderbolt can do a full gigabit while USB 3.0 can only do 100mb - but then again I've seen many USB 3.0 adapters advertised on Amazon as being capable of '10/100/1000 gigabit.' So, what's the verdict? Which is faster? (EDIT: I've also just noticed that some USB 2.0 adapters are listed as '10/100/1000 gigabit' capable. Sep 7, 2018 - Two blue Ethernet cables connected to yellow router ports. You should first hook the Lightning to USB 3 adapter into your iPad. Next, plug the. Are they really as fast as the USB 3.0 and potentially Thunderbolt adapters?). I remember that 100mbps USB2.0 adapters were a bad idea because they incurred significant USB protocol overhead and consumed a lot of CPU resources because every USB packet raised a processor interrupt, whereas hardware NICs (and Thunderbolt) uses the PCI-Ex bus that doesn't interrupt the processor as much, nor require much CPU babysitting - is this still the case with USB3.0? Has anyone profiled a USB2.0 100mbps adapter compared to a Thunderbolt GigE and USB3.x GigE adapter? – Jan 24 '17 at 23:17 •. SHORT ANSWER The answer to your question as asked in the title is it really depends on what ports you have available, personal preference, cost, etc. I say this because both USB 3.0 and Thunderbolt are faster than ethernet, so it doesn't matter which way you go from a speed point of view. More specifically (and at the risk of oversimplifying it): • Ethernet supports up to 1Gbps* • USB 3.0 supports up to 5Gbps • USB 3.1 supports up to 10Gbps • Thunderbolt 1 up to 10Gbps • Thunderbolt 2 up to 20Gbps • Thunderbolt 3 up to 40Gbps *In the overwhelming majority of cases, although 10Gbps ethernet networks do exist. ![]() So, as you can see, it doesn't matter because they're all faster than the ethernet you're converting to. Xbox one controller trigger mod. LONG ANSWER I'm adding this longer answer due to the various comments below my original answer. For starters, ethernet can actually support up to 10Gbps. However, in 99.9% of cases (okay, I can't cite a source for that figure - I'm just making a point) this will not be a practical consideration for users unless they intend to connect to an existing 10Gbps ethernet network. While 10Gbps ethernet is starting to gain some traction in terms of network infrastructure, this is only happening in some of the largest organisations or those that have a particular need for this type of setup (such as ISPs, Cloud providers, data centres, etc). It is also worth noting that Apple has never launched a computer (not even Mac Pros or Servers) that natively support 10Gbps ethernet. One of the reasons for a slow take up rate of 10Gbps ethernet is that it requires full duplex point-to-point links (typically via network switches) and as a result half duplex operation and repeater hubs do not work in 10Gbps ethernet networks.
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