Modern gaming laptops can be equipped with very powerful central processing units and graphics processing units. While such notebooks can offer performance on par with leading-edge desktops, they still feature one of the main drawbacks of mobile PCs: they cannot be easily upgraded. Alienware, a boutique PC maker, this week introduced Graphics Amplifier, a special box for external graphics cards designed for laptops. While the solution is impressive, its popularity is not guaranteed.
Alienware Graphics Amplifier explained
Alienware Graphics Amplifier is an external box that connects only to Alienware 13 laptop (or other future laptops from the company that support a proprietary PCI Express external interface) and provides a PCI Express x16 slot that works in PCI Express 3.0 x4 mode. The box comes with integrated 460W power supply unit and can support a variety of desktop graphics cards, including flagship single-chip graphics solutions with dual-slot air coolers. The Graphics Amplifier gives owners of Alienware 13 notebooks an ability to relatively easily upgrade their graphics processing unit once it gets outdated, which is not a bad idea since Alienware 13 comes with Nvidia GeForce GTX 860M powered by the previous-generation Kepler architecture.
Alienware Graphics Amplifier
Alienware Graphics Amplifier costs $299, which may not be that high, given the fact that this is a very special device for a product that does not belong to the mainstream market. Unfortunately, the Graphics Amplifier works only with Alienware 13 laptops that feature proprietary external PCIe interconnection. Moreover, PCI Express 3.0 x4 interface only provides up to 4GB/s of bandwidth, which was enough for graphics cards some 10 years ago, but which may be not enough for today’s high-performance desktop graphics adapters in modern games.
Why external graphics cards?
Historically, the gap between performance of graphics processing units for notebooks and graphics adapters for desktops was huge, which is why multiple companies worked on various external graphics solutions for mobile PCs.
Gaming PCs in desktop form-factor can consume almost any amount of power and can be very efficiently cooled-down using liquid or high-end air coolers. By contrast, notebooks have many constraints when it comes to power and cooling, which is why all notebook components are designed with strict thermal design power in mind, naturally, those TDP settings are considerably lower compared to those of desktop components, which is a reason why notebooks cannot perform like desktops.
Alienware’s Graphics Amplifier is not the first and only external graphics solution. Back in 2007 – 2008 AMD proposed external graphics port (XGP) technology that provided PCI Express 2.0 x8 or x16 interconnection, but used a sophisticated proprietary connector that was hard and expensive to manufacture. AMD’s XGP did not take off for multiple reasons. Technologically, XGP was more advanced than the Graphics Amplifier since it offered full PCIe bandwidth.
In addition to AMD’s XGP, Asustek Computer developed XG Station enclosure for graphics adapters. Some other makers of PC components also tried to offer external graphics solutions for notebooks, but eventually all of them failed because of the price, compatibility, lack of performance improvement and other reasons.
Multiple companies now offer various Thunderbolt 2.0-based external enclosures for graphics cards. Many of such solutions are designed for professionals and are priced accordingly. Moreover, Thunderbolt 2.0 provides even lower bandwidth than PCI Express 3.0 x4, which means performance limitations. Still, if you need additional performance or additional displays on a notebook, then external graphics adapters are here to help.
Why go external, if there is GeForce GTX 980M?
Thanks to advancements in graphics processing architectures, Nvidia Corp.’s GM204 graphics processor based on the Maxwell architecture can deliver excellent performance while consuming low amount of power. As a result, modern Nvidia GeForce GTX 900M family of notebook GPUs offer performance that is comparable with that of desktop GeForce GTX 900-series offerings.
Since Alienware’s 13” laptop integrates rather mediocre GeForce GTX 860M (1152 stream processors, 128-bit memory bus) graphics processor, an external graphics solution is a way to make this notebook a viable solution for gamers who demand performance. While PCI Express 3.0 x4 interconnection will unlikely let modern graphics processors demonstrate their whole potential, the external Graphics Amplifier is a way to boost performance of the Alienware 13 laptop.
Meanwhile, notebooks powered by GM204 graphics processing units – GeForce GTX 970M or GeForce GTX 980M – should provide desktop class performance, which means enough graphics processing horsepower for virtually all titles for a year or even more from now. Until then, no upgrade will be necessary. When the time for an upgrade comes, one might discover that performance of next-generation graphics processors in next-gen games might be limited by the bandwidth provided by the PCI Express 3.0 x4 interconnection, which will render the Graphics Amplifier obsolete.
While products like Alienware’s Graphics Amplifier may be okay for certain graphics cards and certain games, it should be kept in mind that in select titles they do not let graphics cards to show off all their potential.
If a small laptop cannot integrate a powerful GPU, it makes sense to add an external GPU, boost its performance and turn it into a fully-fledged gaming machine. However, if you have a laptop featuring GeForce GTX 980M, the benefits of an external GPU box like Graphics Amplifier will be very limited.
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KitGuru Says: Perhaps, the biggest news about the Graphics Amplifier is that Alienware decided to give its customers an opportunity to upgrade their notebooks eventually. Traditionally, PC makers are more interested in selling complete new systems to their clients. Still, given a lot of limitations that the Graphics Amplifier has, it does not seem that the product can really be viable for a lot of people.