It’s a humble Chromebook, all clad in plain grey plastics, with a 11.6in, non-touchscreen 1,366 x 768 display. It’s very light, and won’t make a big bulge in your laptop bag at 1.2kg (1.4kg with the charger), but there’s nothing at all exotic about it. The more enticing touchscreen version isn’t slated to appear in the shops until well into 2014.Acer Aspire C720 Chromebook Despite this, the C720 does have something about it. Aside from being extremely light, there’s plenty of connectivity on offer. A closer look at the edges reveals a full-sized HDMI port on the left next to a USB 3 connector and a 3.5mm headset jack. On the right, beside a Kensington lock slot, there’s room for a full-sized SD card and second USB socket, although this time it only runs at USB 2 speed. Under the hood, there’s dual-band wireless and Bluetooth, plus 16GB of internal flash storage.As with all Chromebooks, the C720 is a doddle to set up: turn it on, type in your Gmail username and password, and you’re done. It’s quick to fire up, too. From off, the lockscreen appears in less than seven seconds; from standby, startup is instant – just open the lid.

Performance while it’s in use is impeccable, too, with the C720’s dual-core 1.4GHz Intel Celeron 2955U CPU and 2GB of RAM keeping things going at a responsive lick, no matter how many tabs are open. It copes just fine with streaming Full HD video as well, and gained jaw-dropping results of 357ms in SunSpider and 2,906 in the Peacekeeper HTML5 test. It’s a nippier device than HP’s Chromebook 11.The 'World's First Glasses-Free 3D Laptop' was unveiled at a showcase of the company's upcoming releases, although it's not ready for inclusion in Toshiba's 2011 line-up and may be up to a year away from appearing on the market. (Update: As readers have commented below, Sharp and others have launched glasses-free laptops before, based on different technology.)The laptop uses a webcam to track the user's face and eyes, with the 3D effect created by liquid crystal lenticulars on the 15in screen. It provided a surprisingly pleasing viewing experience in our brief tests.The effect works at an approximate maximum distance of 140cm, and is limited to a 20-degree cone of vision, within which you can shift without losing 3D vision. Slip outside the sweet spot, however, and you'll be returned to a regular 2D experience.

Also somewhat impressive, but slightly disorientating and headache-inducing, is the ability to run 3D content on a regular 2D desktop.Toshiba claims the technology will find a variety of home entertainment and business uses, including virtual 3D tours of houses in estate agents' windows.The full implementation won't arrive in Toshiba products until the beginning of next year. But when it does arrive in a saleable form, and perhaps with infrared sensors included, it could deal a deft blow to devices such as the Sony VAIO VPCF21Z1E, which remain dependent on the awkward specs.The Sony VAIO Pro 13 rises from the ashes of the VAIO Z Series, Sony’s legendary ultraportable. With Intel’s Haswell processors and a Full HD touchscreen packed into a 13in chassis that weighs only a little more than a kilogram, the VAIO Pro 13 is an attempt to redefine what we expect from a lightweight, portable laptop.It’s a subtle evolution rather than a dramatic redesign, though. The same silver flash slashes across the laptop’s rear; the same VAIO logo is writ large across the jet-black lid; and while the VAIO Pro shares its predecessor’s sharp, elegant design, Sony has softened the VAIO Z’s squared-off physique to create a sleeker, more streamlined appearance.

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More dramatically, the redesign sees the VAIO Pro emerge as the lightest 13in Ultrabook ever to grace PC Pro’s Labs. Although the addition of a touchscreen means the chassis is a hair’s breadth thicker than the previous model (18mm rather than 17mm) Sony has trimmed down the weight to a featherweight 1.05kg.As you might expect, there’s a price to pay for such a pared-down design. Despite the liberal use of super-strong carbon fibre, the VAIO Pro’s lightweight frame feels much bendier and more flexible than the Apple MacBook Air or Dell XPS 13. Admittedly, yanking a laptop’s body to and fro is no scientific measure of a laptop’s toughness, but in a field where quality is synonymous with heft and rigidity, the VAIO Pro 13’s ultra-flexible chassis is a mite disconcerting.In all the key areas, however, the VAIO Pro oozes quality, and Sony has clearly been hard at work improving on the VAIO Z Series’ ergonomics. The Scrabble tile keyboard is far more responsive and comfortable than before, as each key now has noticeably more travel and feedback, and the small, moderately fiddly touchpad has made way for a much larger one with a buttonless design.

The good news continues elsewhere. Accommodating a touchscreen in a 1.05kg laptop is a feat in itself, but the VAIO Pro’s Full HD touchscreen is as good as they get. The Windows 8 Start screen bursts forth in a riot of colour, and reacts instantly to the lightest brush and sweep of a finger, tiles sliding by with delicious fluidity.The Sony’s 13in display is technically excellent, too. Brightness reaches an ample 345cd/m², and thanks to the panel’s excellent black levels, the contrast ratio of 932:1 is up there with the very best Ultrabooks. The panel’s colour temperature and gamma are a mere whisker away from perfection. Viewing angles are wide and colour accuracy is very good – the VAIO Pro 13’s display produced an average Delta E of 3.1, which is excellent by laptop standards. The only minor niggle is that the Sony’s touchscreen layer adds a slight graininess to images, but it isn’t distracting.

The VAIO Pro 13 packs ample performance into its stick-thin chassis. Our review unit partnered one of the latest Intel Haswell processors – the dual-core 1.8GHz Core i7-4500U – with 4GB of DDR3L low-voltage RAM and a 128GB SSD. In everyday use, it’s just as responsive as the best Ultrabooks, with ultra-quick start-up times and enough power to whip applications into view in the blink of an eye.For raw application speed, though, Intel’s Haswell processors are no quicker than their Ivy Bridge predecessors. Performance in our Real World Benchmarks was broadly similar, and the VAIO Pro 13 returned an unremarkable score of 0.62.Typically, today’s budget PCs come with 4GB of RAM. A mid-range configuration may offer double that, and high-end gaming systems and workstations go as high as 16GB.And there’s no doubt which way the wind’s blowing: Windows 8 supports up to 128GB of physical memory (assuming you’re running the 64-bit edition), while Windows 8 Pro can go up to 512GB. Does anyone really need this much RAM? Memory isn’t as expensive as it used to be, but there’s no point paying for gigabytes of RAM from which you’ll receive no material gain.

Many people assume that adding memory makes a PC significantly faster, and in some cases it does. Sticking an extra pair of DIMMs into a motherboard won’t change the speed at which the processor executes code, but it can help in other ways, especially on older systems with 2GB of RAM or less, since adding RAM reduces the need for Windows to rely on "virtual memory”.Many people assume that adding memory makes a PC significantly faster, and in some cases it does. Many people assume that adding memory makes a PC significantly faster, and in some cases it does.Simply put, virtual memory is a file on your hard disk that serves as temporary storage when your PC’s "real” memory is full. Virtual memory makes it possible, for example, to have several heavyweight applications running at once, even if they won’t fit simultaneously in RAM. When you switch from one to another, Windows quickly swaps the relevant data from the disk into real memory, which explains why the virtual memory file is sometimes called a "swap file”. If you’ve set Windows Explorer to show hidden files, you can see the swap file in the root directory of your system disk; depending on which version of Windows you’re using, it will be called pagefile.sys or swapfile.sys.

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The process of shuttling data to and from the swap file slows things down, especially if you’re using an old-school mechanical disk. The situation gets worse if you try to open a new program when your memory is full: the disk head ends up "thrashing” back and forth across the disk as it tries to read the new data into memory while simultaneously moving older information into the swap file. The result is a slow and unresponsive PC.If you’ve ever used Windows XP on a machine from the late 1990s or early 2000s, you’ll almost certainly have sat through your fair share of disk-thrashing sessions. Although contemporary 32-bit PCs were theoretically able to address up to 4GB of RAM, memory was expensive, and even a high-end system may have come with only 256MB installed. A reliance on virtual memory was a fact of life – hence the rule of thumb that you should install as much memory as you can afford.The rule is much less applicable today than it was a decade ago. Today, a new PC will come with multiple gigabytes of RAM, so Windows relies much less on virtual memory. It’s also almost certain to come with a solid-state system drive rather than a mechanical one, making the process of swapping data between RAM and virtual memory much smoother. Since SSDs have no problem reading from one flash memory cell while writing to a different one, they effectively eradicate the problem of "thrashing”.

The 'World's First Glasses-Free 3D Laptop' was unveiled at a showcase of the company's upcoming releases, although it's not ready for inclusion in Toshiba's 2011 line-up and may be up to a year away from appearing on the market. (Update: As readers have commented below, Sharp and others have launched glasses-free laptops before, based on different technology.)The laptop uses a webcam to track the user's face and eyes, with the 3D effect created by liquid crystal lenticulars on the 15in screen. It provided a surprisingly pleasing viewing experience in our brief tests.The effect works at an approximate maximum distance of 140cm, and is limited to a 20-degree cone of vision, within which you can shift without losing 3D vision. Slip outside the sweet spot, however, and you'll be returned to a regular 2D experience.Also somewhat impressive, but slightly disorientating and headache-inducing, is the ability to run 3D content on a regular 2D desktop.

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