The Changing Role of Displays

Thunderbolt carries PCIe and DisplayPort, which enabled Apple to change the role of its display. The Thunderbolt Display is no longer a passive monitor, but it's a full fledged docking station.

Thunderbolt can carry PCIe x4, that's four lanes, which gives Apple the ability to put four PCIe x1 devices in the display itself. Apple chose wisely and included a Broadcom Gigabit Ethernet controller (BCM57761), a FireWire 800 controller and a USB controller. The FaceTime HD and integrated audio codec both use the internal USB controller. Just to be clear, these controllers are present independent of what you connect to the Thunderbolt Display. If you have a Mac with an integrated Gigabit Ethernet controller, hooking it up to the Thunderbolt Display now gives you two GigE ports - and you can use them both in tandem if you'd like. The same goes for FireWire 800 and USB.

Apple doesn't see the Thunderbolt Display as a way to offer more expansion ports, but rather a way to shift those ports to a different location. Chances are you won't need GigE while mobile, but you would like it while at your desk. The same goes for FireWire 800.

What's particularly awesome about the Thunderbolt Display's integrated controller farm is what it does to MacBook Airs. The 2011 MBAs ship with two USB ports and a Thunderbolt port, that's all you get in terms of high-speed IO. With their internal SSDs capable of moving data at up to 200MB/s, you're quickly bottlenecked by the MBA's 802.11n WiFi stack. Had Apple included a Gigabit Ethernet port on the MBA it would ruin the thin form factor. The Thunderbolt Display takes care of all of this. Connect a MacBook Air to a Thunderbolt Display and not only do you get more pixels, but you get more connectivity. Gigabit Ethernet and FireWire 800 are now retrofitted to the MacBook Air. For those notebook-as-a-desktop users who migrated from old MacBook Pros to the 13-inch MacBook Air, the Thunderbolt Display is a must-have. The biggest feature for me is Gigabit Ethernet. For large file transfers 802.11n just doesn't cut it.

While connected you can use the Thunderbolt Display with your MacBook Pro/Air closed or open as a secondary display just like you could with last year's 27-inch LED Cinema Display.


These aren't just ports, they are backed by controllers physically located within the display

The Thunderbolt Display not only adds functionality but it also simplifies cable management as a result. Users who are constantly docking and undocking their notebooks now only have to deal with two cables: power and Thunderbolt. Whereas today I have no less than seven cables plugged into my notebook.

The Limitations

What's missing from the Thunderbolt Display's port repertoire? For starters, there's no analog audio out. While the display does feature a pair of integrated speakers, they don't produce the best sound in the world. Thanks to their diminutive size and unusual enclosure, the speakers don't cover a lot of dynamic range and you can forget about any ultra low frequencies. If you like bass, you still need a sub. Unfortunately there's no way to use the display's integrated audio codec to drive external speakers. You either have to plug a 1/8" stereo cable into your Mac or buy a USB sound card and connect your external speakers to it. In my opinion this is a pretty significant oversight. It either defeats the purpose of the simplified cable setup by requiring you plug in yet another cable into your Mac to use external speakers, or it defeats the purpose of having an integrated audio controller since you need another USB audio controller to get audio out. This is something Apple could've easily solved by just including a 1/8" jack on the back of the display.

Apple has done a great job of including SD card readers on most of its Macs (although I'd love one on the 11-inch MBA, ahem #waystomakeanandhappy). The Thunderbolt Display oddly enough doesn't include an SD card reader. If it weren't for this and the missing 1/8" jack you'd have almost no reason to reach over to your Mac once at your desk.

There's also no USB 3.0 support. While Thunderbolt does enable some very high speed IO, there are still far more USB 3.0 devices than Thunderbolt devices. Not to mention that you likely won't see Thunderbolt enabled flash memory sticks but we already have quite a few portable USB 3.0 drives. USB 2.0 is just ungodly slow today and I'd much rather have Apple introduce USB 3.0 support with its first Thunderbolt Display instead of introducing it with an updated version down the road. The controllers are available on the market today, although it won't be until next year with Ivy Bridge before Apple considers enabling USB 3.0 on Macs.

The final complaint shouldn't come as a surprise, but the Thunderbolt Display just doesn't have enough USB ports in my opinion. The MacBook Pro & Air come with two, while all desktop Macs have at least four. The Thunderbolt Display only gives you three. USB hubs are easy to come by, but I would've preferred to see at least 4 or 5 on the display.

Apple's Thunderbolt Display Testing the Pieces
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  • name99 - Friday, September 23, 2011 - link

    "The iMac and displays like this compell people to discard those expensive displays far ahead of their time and likely buy another display of the same size and resolution."

    And discard means WHAT? I can go to eBay and see the prices for second hand macs. What's stopping you from selling your iMac, or giving it to a friend/family member/school?

    You claim there area significant number of still-working flat-screen iMacs in closets or the trash. I call bullshit.
  • dave1_nyc - Friday, September 23, 2011 - link

    Anand, I liked the review, and I think this sounds like interesting technology, but honestly, but you sound as though you've never used a docking station. Yes, you're right, they are all proprietary, but the good ones from Dell and Toshiba (and I'm sure others) are terrifically useful if one needs one.

    I don't, but there are people in my org for whom their laptops are their main machines and they take them back and forth between the office and home every day. All the modern docking stations provide pretty much any connectivity you could want, and they allow you to use any monitor you want, and switch out monitors.

    Further, while connecting two cables (a la the review) isn't hard, with the laptops and docking stations we have you walk up and set the laptop down onto the station connectors. At which time the laptop (if thus setup) turns on, adjusts for the external display (or two), and that's that. If you have automatic login, you never have to open the laptop.

    Expensive? We pay $150 for them, and with that comes the freedom to upgrade either the docking station (such as when the USB 3 ones come out early next year) or the monitor independently of each other.

    Of course, the real docking stations (as opposed to those USB 2 things) are only found in 'business class' machines, but those machine can now be configured with discrete graphics if one wants.

    I'm not trying to sell docking stations, but you're usually not quite so inaccurately dismissive.
  • jecs - Friday, September 23, 2011 - link

    I agree with you. I think Apple or someone else should produce a docking station for Mac Books. I remember when I used those with an IBM laptop some years ago.

    If you want to use "an all Apple technology" the thunderbolt display is fine. But if you want a MBP and have a different need you will find yourself limited in options. But those parts need to be competitive in price and quality.
  • Constructor - Friday, September 23, 2011 - link

    Why are you limited? Simply use a different Thunderbolt docking solution instead of the ready-made Thunderbolt Display.

    With Thunderbolt you can even customize your own special solution in a way you never could before, by daisy-chaining multiple Thunderbolt devices according to your own specific needs.

    And the kicker is that you can carry it all over to a new machine, even when switching manufacturers and even platforms!

    None of the pre-existing docking solutions ever came close to that.
  • Trefugl - Saturday, September 24, 2011 - link

    But where are all these external devices that I can so easily purchase and make my own docking solution? Last I checked (admittedly a few weeks ago), there was a very limited selection on adapter types on the market.

    I do agree that this is a great solution (and one that actually makes me excited about thunderbolt), the problem is that no one has made an external hub like what's in the display yet... they might now that PCs are getting the same connector next year, but it just blows my mind that the first place you see this tech is stuffed inside a monitor (one that only can work at all with new '11 Macbooks...)
  • Constructor - Saturday, September 24, 2011 - link

    Well, it works with all current Macs (the Mac Pro is the only one that hasn't been upgraded to Thunderbolt yet).

    And I would not be surprised if the availability of Intel Thunderbolt controllers was one of the reasons why third party devices are being delayed – at the number of Macs Apple is producing, it is quite possible they're buying every chip Intel manages to get out the door. But Intel has lots of experience with mass production of high-grade chips, so I have no doubt availability will catch up soon if it hasn't already.

    Belkin is apparently designing effectively a Thunderbolt Display without the display:
    http://gizmodo.com/5839952/belkins-thunderbolt-exp...">Belkin's Thunderbolt Express Dock Finally Gives You a Reason to Remember You Have Thunderbolt

    And there's more in the pipeline from various manufacturers. Unsurprisingly, professional-grade interfaces which actually need the speed and low latency are among the first.
  • Constructor - Saturday, September 24, 2011 - link

    The link has been crippled, apparently. This should work:
    http://gizmodo.com/5839952/belkins-thunderbolt-exp...
  • AbRASiON - Friday, September 23, 2011 - link

    Defective by design.
  • stepa - Friday, September 23, 2011 - link

    Simple question (requires a simple answer)

    So does it mean that there is no way to connect this display to a windows pc as a main display?i know that with previous models you could use an adapter or newer gfx cards already have a display port.so this a no go for pc users?
  • KPOM - Friday, September 23, 2011 - link

    Not until PCs with Thunderbolt ports start coming out next year. I suspect a lot of the Ultrabooks will do so since Thunderbolt support will be built into some of the Ivy Bridge chipsets.

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