{"id":37294,"date":"2016-07-29T12:00:00","date_gmt":"2016-07-29T17:00:00","guid":{"rendered":"https:\/\/eshop.macsales.com\/blog\/?p=37294"},"modified":"2020-10-06T10:42:18","modified_gmt":"2020-10-06T15:42:18","slug":"tech-101-what-thunderbolt-3-speeds-and-capabilities-mean-for-you","status":"publish","type":"post","link":"https:\/\/eshop.macsales.com\/blog\/37294-tech-101-what-thunderbolt-3-speeds-and-capabilities-mean-for-you\/","title":{"rendered":"Tech 101: Thunderbolt 3 Speeds, Capabilities and Caveats"},"content":{"rendered":"\n
\"Thunderbolt
Thunderbolt is a registered trademark of Intel.<\/figcaption><\/figure><\/div>\n\n\n\n

This is the second in a series of articles on the Rocket Yard discussing Thunderbolt 3 technology. Last week, the first article gave readers a rundown on the history of Thunderbolt, a hardware interface that was designed from the start to connect multiple external peripherals \u2014 like external disk drives and high-definition monitors \u2014 at very high data rates. This week\u2019s post discusses just how fast and powerful Thunderbolt 3 is, backward compatibility issues with existing Thunderbolt 2<\/a> devices, the decision to use the USB Type-C connector for Thunderbolt 3, and how Thunderbolt 3 compares to current competing interface technologies.<\/p>\n\n\n\n

Theoretical Speeds<\/strong><\/h2>\n\n\n\n

With a maximum theoretical transfer rate of 40 Gigabits per second (5GB\/second), Thunderbolt 3 is undoubtedly fast (we\u2019ll share more on what is needed to actually reach the theoretical 40Gbps later in this article<\/i>). That\u2019s twice the speed of Thunderbolt 2, and four times the transfer rate of the original Thunderbolt specification.\u00a0What this means for Mac and PC users is that writing data to an external drive for backups or storing large media files is much faster, as is the retrieval of data from those drives.<\/p>\n\n\n\n

But external hard drives, RAID arrays, or solid-state drives aren\u2019t the only devices that can be used with a Thunderbolt 3 connection. Since the job of connectivity technologies like Thunderbolt is to \u201cmove bits\u201d, those bits can be displayed on a monitor just as easily as they can be stored on media. The original Thunderbolt specification was good enough to drive Apple\u2019s discontinued Thunderbolt Display, which displayed 2,560 X 1,440 pixels on a 27-inch diagonal display (a 16:9 aspect ratio).<\/p>\n\n\n\n

Thunderbolt 2 made it possible for a Mac or PC to drive a 4K (UHD-1) display with a resolution of 3,840 X 2,160 pixels, once again at a 16:9 aspect ratio. Even more importantly, Thunderbolt 2 can simultaneously deliver that 4K (2160p) video stream to a display and to storage.<\/p>\n\n\n\n

Both the original Thunderbolt and Thunderbolt 2 pale by comparison to Thunderbolt 3 in terms of speed. The new hardware provides enough speed to deliver video to two 4K displays at a 60 frame per second refresh rate or to a single 4K display at 120 frames per second.<\/p>\n\n\n\n

Compatibility Caveat<\/strong><\/h2>\n\n\n\n

One of the big questions facing many Mac and PC owners is whether their existing Thunderbolt devices \u2014 whether it\u2019s displays, drives, or docks \u2014 will work with future computers equipped with Thunderbolt 3 ports. That\u2019s a good question since Thunderbolt 3 does away with the Mini DisplayPort connectors used for Thunderbolt and Thunderbolt 2, replacing them with USB Type-C (AKA USB-C) connectors.<\/p>\n\n\n\n

Unfortunately, it\u2019s a good question without<\/i> a good answer \u2013 at least for many users and future Thunderbolt 3 adopters. Because Thunderbolt 3 uses the USB Type-C connector, users will need an adapter to allow the connection of original Thunderbolt\/Thunderbolt 2 peripherals to Thunderbolt 3-equipped computers, which is an added expense and inconvenience that many might not be happy with. It also should be added that Thunderbolt 3 devices will likely never be compatible with a Thunderbolt 2 host.<\/p>\n\n\n\n

\"Thunderbolt
Thunderbolt 3 cable using the USB Type-C (USB-C) connector<\/figcaption><\/figure><\/div>\n\n\n\n

Daisy Chains<\/strong><\/h2>\n\n\n\n

Another feature of Thunderbolt has been the ability to daisy-chain devices; in other words, connecting a computer to a first device with two Thunderbolt ports, then connecting that to a second device with two ports, and so on. With Apple\u2019s initial Thunderbolt devices, up to six devices could be connected to a single Thunderbolt port, with a DisplayPort monitor like the Thunderbolt Display at the end of the daisy chain.<\/p>\n\n\n\n

Thunderbolt 3 continues the tradition of daisy-chaining devices. By using the USB Type-C connector standard, Thunderbolt 3 ports can provide up to 15 Watts of power to the daisy-chained devices.<\/p>\n\n\n\n

USB Type-C, Thunderbolt 3 & Potential Confusion<\/strong><\/h2>\n\n\n\n

In previous paragraphs, I\u2019ve referred to the fact that Thunderbolt 3 uses the USB Type-C connector. If you\u2019ve had the opportunity to look at or work with an Apple 12-inch Retina Display MacBook<\/a> \u2014 the only Mac equipped with\u00a0USB-C at this time \u2014 you\u2019ve seen a tiny port and connector that is bi-directional. In other words, unlike the traditional USB connector or the Mini DisplayPort connector used with Thunderbolt and Thunderbolt 2, there\u2019s no \u201cwrong way\u201d to plug in the connector, no up or down. Take it from a person who almost always tries to plug USB devices upside-down the first time, USB-C\u2019s form factor is refreshing.<\/p>\n\n\n\n

Moving Thunderbolt 3 to the Type-C connector allows for a smaller connector, meaning that less volume is consumed in computers for the interface. Thunderbolt 3 and USB 3.1 Gen 2 support will be provided by the computer\u2019s Thunderbolt chipset, and one (or more) port will be able to support both USB 3.1 Gen 2 and Thunderbolt 3 devices. How will you know if a port supports just USB or Thunderbolt 3 and USB? You\u2019ll have to look for the little \u201cLightning Bolt\u201d icon that graces the Thunderbolt port.<\/p>\n\n\n\n

Any USB-C device that is plugged into a Thunderbolt 3 port will work, but at the slower USB-C speeds. So what about a Thunderbolt 3 device plugged into a USB-C-only port? If that device is something like a power adapter, it will probably<\/i> work, but transferring data won\u2019t happen. Expect some confusion for a while as USB-C becomes ubiquitous on more devices and Thunderbolt 3 support is added later.<\/p>\n\n\n\n

Cable Capabilities<\/strong><\/h2>\n\n\n\n

Although Thunderbolt 3 cable prices are likely to be lower than those for the two original Thunderbolt implementations, there is a catch \u2013 there will be both passive and<\/i> active cables available. And all cables are not<\/i> created equally in build and in price\u2026<\/p>\n\n\n\n

A passive Thunderbolt 3 cable at 0.5M length can push data at 40 Gbps however 1M an 2M can only hit 20 Gbps; the same speed as Thunderbolt 2 and twice the speed of USB. You\u2019ll be able to use passive Thunderbolt 3 cables as USB-C however a USB-C cable cannot<\/i> be used as a Thunderbolt 3 cable. But to get the raw speed out of Thunderbolt 3 at 40 Gbps at 1M or longer, you\u2019ll need what\u2019s called an active Thunderbolt 3 cable.<\/p>\n\n\n\n

What\u2019s the difference? The active cables have chips built into them to allow the highest possible data transfer speeds. Active cables are a must if you\u2019ll be connecting your workstation to an SSD-based RAID array<\/a> for raw storage speed. Those cables will be no more than six feet (2 meters) in length. For further distance requirements, some Thunderbolt 3 active cables may use fiber optics rather than copper to push the signal up to 200 feet away.\u00a0<\/strong><\/p>\n\n\n\n

Adapters<\/strong><\/h2>\n\n\n\n

So, your future 2017 MacBook Pro has a bunch of Thunderbolt 3-capable USB Type-C ports on it, but nothing else \u2014 kind of like a 12-inch MacBook on steroids. You\u2019ll likely be in the market for adapters. USB-C adapters for HDMI, VGA projectors, Ethernet, and so on that you can buy today should\u00a0work just fine when plugged into that Thunderbolt 3 port\u00a0provided they use the correct type of cable and\/or adapters. Of course, we will keep you\u00a0informed about the compatibility of specific devices or features as more Thunderbolt 3 host products come to the market.<\/p>\n\n\n\n

Spec Wars<\/strong><\/h2>\n\n\n\n

What other technologies are currently competing with Thunderbolt 3? Let\u2019s take a look at what\u2019s available:<\/p>\n\n\n\n

FireWire<\/strong> \u2013 Although FireWire S1600 and S3200 standards were developed, with the latter allowing data transfer speeds up to 3.4157 Gbps, almost no devices were actually manufactured for sale. The one exception was a Sony camera sold in 2012 that supported FireWire S1600.<\/p>\n\n\n\n

eSATA<\/strong> \u2013 eSATA is an implementation of the Serial ATA data bus that\u2019s meant for use with external drives. The most current version of eSATA is eSATA 6G, which tops out at 6 Gbps. MacSales.com offers an ExpressCard\/34 eSATA adapter for the older (2006-2011) MacBook Pro<\/a>, and eSATA PCI-Express cards for the older (2006-mid 2012) Mac Pro<\/a>, but there\u2019s nothing for the newer Macs. It appears that eSATA has been bypassed by faster and more capable interface options. <\/strong><\/p>\n\n\n\n

USB 3.1 gen 2<\/strong> \u2013 I don\u2019t really see USB 3.1 gen 2 as competing with Thunderbolt 3 \u2014 instead, they coexist, able to use the same port. (For much more on USB 3.1, read our History of USB article here<\/a>.)<\/p>\n\n\n\n

\"OWC
OWC Jupiter Kore.<\/figcaption><\/figure><\/div>\n\n\n\n

SAS\/Mini SAS<\/strong> \u2013 Back in the dark ages of computing (1980s \u2013 1990s) there was a common way to connect computers and peripherals called SCSI (Small Computer System Interface). I won\u2019t go into its qualms, but let\u2019s just say that it\u2019s good things moved on. SCSI has evolved into SAS \u2014 Serial-Attached SCSI \u2014 and it\u2019s a fast way to connect computers to mass amounts of storage. Mini SAS connectors and cables can be doubled up to produce data transfer speeds of up to 48 Gbps, as seen in the OWC Jupiter Kore Mini SAS Connected JBOD Storage System<\/a>. The only issue? Finding a computer that can use a Mini SAS adapter card. An older Mac Pro (pre-late 2013) will work, but unfortunately, no modern Macs have the internal PCI-e ports that those adapters can plug into.<\/p>\n\n\n\n

10 Gbps Ethernet<\/strong> \u2013 Ethernet has been around since the 1980s as a wired network protocol, and it works great for sharing mass storage as well. Creative professionals and others who need access to hundreds of terabytes of storage use network-attached storage (NAS) and storage area networks (SAN). 10 GBps Ethernet is used to connect single or multiple devices to storage devices like OWC Jupiter Callisto Ethernet Connected Shared Storage<\/a>. The Mac Pro hasn\u2019t yet caught up to 10 Gbps Ethernet, featuring a pair of 1 Gbps Ethernet ports. Fortunately, devices like the Jupiter Callisto are operable at the slower Gigabit Ethernet speeds.<\/p>\n\n\n\n

Related article:<\/strong>\u00a0Commentary: Apple Should Renew Focus on Mac Users, Pros<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

This is the second in a series of articles on the Rocket Yard discussing Thunderbolt 3 technology. Last week, the first article gave readers a rundown on the history of Thunderbolt, a hardware interface that was designed from the start to connect multiple external peripherals \u2014 like external disk drives and high-definition monitors \u2014 at […]<\/p>\n","protected":false},"author":16,"featured_media":31010,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"spay_email":"","footnotes":""},"categories":[339,4],"class_list":["post-37294","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-product-spotlight","category-tech-tips"],"yoast_head":"\nTech 101: Thunderbolt 3 Speeds, Capabilities and Caveats<\/title>\n<meta name=\"description\" content=\"Thunderbolt is a registered trademark of Intel. 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