The idea of an external PCI-Express chassis for video cards is practically as old as PCI-Express itself. However over the years the idea has failed to reach the consumer market as a complete product, even with the introduction of standardized external PCIe interfaces such as Thunderbolt. Various prototypes have been shown, but in practice the only way to acquire such a rig has been to build it yourself, combining an ExpressCard slot and its pokey PCIe 2.0 x1 link with an external PCIe chassis.

Thankfully it looks like the PC industry is finally going to turn the corner on the concept thanks to Alienware. Today Alienware is introducing their own PCIe video card chassis, the Alienware Graphics Amplifier.

Alienware’s amplifier is a fairly typical take on the concept – there are only so many ways to build an external PCIe chassis – however Alienware has been able to put together something that is clearly tuned for video cards. The chassis itself houses a PSU and a single x16 PCIe slot for a video card, along with a quartet of USB 3.0 ports for any other I/O needs. Notably, Alienware has designed the amplifier to be able to handle double-wide video cards up to 375W, which is quite a bit more power than professional grade external PCIe chassis, and this means it can conceivably run just about any self-contained video card on the market. That said, like many small form factor computers the amplifier is also clearly designed for video cards with fully exhausting blowers, so it’s going to be best paired with reference model video cards since blowers are nearly non-existent in custom cards these days.


Alienware's Graphics Amplifier Opened (Image Courtesy Gizmodo)

More interesting perhaps is the PCIe interface, which up until now has always been the sticking point in getting a video card chassis to market. The good news is that Alienware has more or less solved the problem, but the bad news is that the interface is a proprietary Alienware/Dell design that is only available on their laptops. Alienware notes that the interface is actually a PCIe + USB interface – apparently carrying USB over from the host rather than using PCIe to power a separate controller – and in the meantime we’re still working to determine just how many PCIe lanes the interface is carrying. Even if it’s not a full 8 lanes (the Haswell U series CPUs don’t support 16 lanes), given the severe bandwidth limitations of ExpressCard and Thunderbolt, even a 4 lane setup would represent a significant improvement in bandwidth. Like Thunderbolt however this interface does appear to use active cabling (it would be very difficult to carry that much bandwidth externally without it), in which case the cable is going to be an expensive part of the entire setup.

On the host side, the amplifier is being launched alongside the Alienware 13, which will be the first of what will presumably be a series of Alienware laptops to support the amplifier’s interface. Rather than hanging off of spare PCIe lanes, we suspect some kind of MUX is in play here, as Alienware has noted that the 13’s internal dGPU (a GeForce 860M) has to be shut off to use the amplifier interface. Most likely Alienware is rerouting the GPU’s lanes to the interface when it’s in use. Activating or deactivating the interface does require a reboot, which although not especially convenient bypasses some very messy issues that could occur when hot-plugging an active GPU, and we suspect would otherwise be a show-stopper.


Alienware's Graphics Amplifier Up Close (Image Courtesy Gizmodo)

Meanwhile it’s interesting to note that in their development process Alienware has been able to solve some of the technical issues around an external video card in the process to better integrate it with the host. The video card in an amplifier can be used to drive both external and internal displays, meaning that it’s possible to use the amplifier to drive the 13’s built-in display and still reap the benefits, even without an external monitor. The overall non-portability of the 7lb+ amplifier and the USB ports strongly drives the amplifier towards being used as a docking station with an external monitor, but if you want to use it to drive the internal display that is going to be a viable option.

Moving on, Alienware is taking a vendor agnostic approach with the amplifier and will be supporting NVIDIA as well as AMD GPUs. There are still some additional technical details we’re chasing down on how this will work with the internal display capabilities, but ultimately it means the amplifier can be used with a wide range of cards from both vendors. That said, since the amplifier is going to be best paired with a blower type video card, NVIDIA’s cards are going to be the more natural fit at this time. Alienware has been showing the amplifier off with the GTX 980, and next to being the most powerful single-GPU video card on the market it also has a reference blower that is an excellent match for the amplifier’s cooling capabilities.

Finally and perhaps most importantly, Alienware has made it clear that the amplifier isn’t a prototype and won’t be vaporware, and that we’re looking at an external video card chassis that is actually going to ship. Alienware will begin taking orders for the amplifier today alongside the Alienware 13 laptop, with the hardware shipping in November. Even the price is decent (especially compared to DIY attempts), with the amplifier set to cost $299. This is on top of the price of the Alienware 13 laptop and the video card to fill the amplifier with, so the total cost of a setup is still going to be significant, but despite being the first shipping consumer solution it’s not priced through the roof.

Source: Alienware

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  • foxtrot1_1 - Tuesday, October 28, 2014 - link

    This is pretty cool, but a proprietary connector? Come on.

    Isn't this what Thunderbolt is supposed to be all about? If, you know, Intel actually cared about increasing adoption.
    Reply
  • Kumouri - Tuesday, October 28, 2014 - link

    From what I've heard, one of the big things that is keeping the few Thunderbolt external video card interfaces we've seen as prototypes from shipping as final hardware is that Intel is refusing to validate any thunderbolt device for external video cards. So Intel is specifically stopping this from happening. Hence the proprietary connector.

    Beside that issue, Thunderbolt v1 is 10Gb/s each direction for 20Gb/s total, and v2 is 20Gb/s total. With PCIe 2.0 being 4Gb/s each direction, that puts us at 2.5 lanes per direction per thunderbolt cable, or 5 PCIe 2.0 lanes total. From what I've seen you barely lose performance going from x16 2.0 to x8 2.0, but you start to really feel bandwidth bottlenecks around the move from x8 to x4. So if you wanted better performance you would NEED to use a proprietary connector.

    It really is a shame that they have to use a proprietary connector but it was certainly their best/only option. Hopefully someone (or Dell/Alienware) can reverse engineer the whole thing and we can make some converters or something. Or maybe they can just sell a PCIe card or USB 3.0 card (with worse performance) or something that converts to the proprietary connector.
    Reply
  • SirKnobsworth - Tuesday, October 28, 2014 - link

    1) Both TB1 and 2 are 20 Gbps in each direction. The difference is that TB1's two links can't both be dedicated to the same use.

    2) Anandtech's <a href=http://www.anandtech.com/show/7987/running-an-nvid... testing</a> suggested that the performance drop was minimal over TB's PCIe 2.0 x4 interface.
    Reply
  • Kumouri - Tuesday, October 28, 2014 - link

    1. I must have read that wrong, that's my mistake. I forgot they had 2 channels.

    2. It shows little drop in some cases, but significant performance drop in others. I would call TB2 a stop gap, at most, with more bandwidth definitely needed.

    3. Intel still isn't allowing companies to use TB for external GPUs. They won't license it and aren't doing validation, from what I've read. Here is a <a href="http://forums.macrumors.com/showthread.php?t=16829... to the macrumor's forum with mentions that Intel is blocking all eGPU enclosures from using TB. I haven't researched this in a while, but you should be able to find more mentions of it if you google it. (hopefully my link works correctly xD)
    Reply
  • SirKnobsworth - Tuesday, October 28, 2014 - link

    Yeah, the biggest problem with Thunderbolt it Intel's policies on it.

    And TB3 should offer some bandwidth increase, though the PCIe link will still be only x4 (but 3.0 so you get 32 Gb/s).
    Reply
  • FITCamaro - Tuesday, October 28, 2014 - link

    I definitely would like to see the performance of this versus a desktop with roughly the same hardware. Reply
  • A5 - Tuesday, October 28, 2014 - link

    I somehow get the feeling that I could just build a desktop for what this thing is going to cost... Reply
  • phoenix_rizzen - Tuesday, October 28, 2014 - link

    Sure, but could you take your desktop to the coffee shop, or the library, or the office as easily as you could the laptop?

    Yes, if you never, ever move the laptop away from the amplifier, then a desktop would be a better value. But if you only need the amplifier some of the time (home to play games or do CAD or graphics) and want the portability of the laptop for the rest of the time, this makes sense.
    Reply
  • Michael Bay - Saturday, November 1, 2014 - link

    If one has a modicum of taste, he`d never take anything by alienware anywhere. Reply
  • MDX - Sunday, November 2, 2014 - link

    Just asked my gf what she thought of the alienware. Her answer "they look cool, and I love the lights!". Reply

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