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Despite the lower price the hardware hasn’t taken a hit. In fact, in many ways it’s superior. At 1.09kg, it’s over 200g lighter than the previous model, and the ergonomics haven’t suffered at all. There’s still a sizeable keyboard with a well-designed layout, and the keys have enough travel for longer typing sessions.The multitouch touchpad is broad and sensitive and supports two-fingered scrolling. We don’t like the lack of discrete buttons, but didn’t experience any problems with the cursor jumping around as we clicked and dragged our way around.Connectivity has improved. One of the two USB sockets on the Chromebook’s rear edge has become a USB 3 socket, and there’s now a full-sized HDMI output in addition to the SD card slot and 3.5mm headphone jack it had before. The 3G model also has a SIM card slot under a flap at the rear.The practical, matte-finish screen has a few more pixels, replacing the original’s 16:10, 1,280 x 800 panel with a 16:9, 1,366 x 768 unit. Image quality is underwhelming, though. With maximum brightness of only 219cd/m2, it doesn’t blaze with life, and while the contrast ratio of 296:1 is good by budget laptop standards, pictures and video lack the vivid punch of glossy screened models.

With that screen set to just below mid-brightness you can expect between nine and ten hours of continuous use from the battery. That’s with Wi-Fi off and no more than a little word processing, mind you. You can expect that figure to fall closer to Google’s quoted 6hrs 30mins once you boost the brightness and start browsing the web.There are changes inside as well, with a dual-core 1.7GHz Samsung Exynos 5 ARM processor providing all the grunt. In the SunSpider JavaScript benchmark, the Chromebook returned a score of 892ms – on a par with the fastest ARM devices we’ve seen, including the recently reviewed iPad 4.Lenovo has announced plans to launch a fresh batch of Chromebooks this summer, giving a further boost to Google's lightweight laptops.The company has only released one Chromebook to date, the rugged, $499 ThinkPad x131e targeted at schools. Released in the US almost a year ago, the device never came to the UK and was only available for bulk order.But Lenovo has warmed up to the Chromebook concept, with its president of North American operations, Jay Parker, promising "multiple Chromebook models" for consumers this year.

"I think Chromebooks can be very impactful in the market really quickly," Parker told CNET at CES. "We believe the market will accelerate greatly in the next 12 months."Parker added that the new models would cover a variety of prices and configurations, but didn't say where they would go on sale.The firm's plans are a further sign that the Chromebook concept is gathering momentum. Toshiba has just entered the Chromebook market with a £249, 13.3in laptop running Intel's Haswell processor. LG unveiled the 21.5in Chromebase all-in-one late last year, while Acer recently updated its C720 touchscreen Chromebook line.Google itself has used CES to trumpet the Chromebook's future, hinting at "plenty more in store" for the year ahead.Britain’s mobile data tariffs are among the lowest in the world. According to an OECD (the Organisation for Economic Co-operation and Development) study published in July 2013, only Australia’s are cheaper.

All the same, committing to a large monthly data allowance can still rack up costs over the course of a two-year contract. And if you opt for a smaller cap, then use up your whole allowance during any given month, you’ll be charged extra for additional “out-of-bundle” usage. If you can keep your data usage within reasonable limits, you can save real money.How much data do you get, and how much do you need?Before you worry about reducing your data usage, start by working out whether you actually need to. If you don’t know your monthly data allowance, you can normally check it on your provider’s website, or by giving them a call.Getting the measure of how much data you actually use involves a bit more work: your month-to-month usage should be detailed on your bills, but the precise figure will naturally vary from one period to the next. Digging back several months will give you a good idea of your average usage – and whether it’s stable or gradually creeping upwards.Once you know this, you can start making informed choices. It may be that you don’t need to reduce your usage: if you have a 500MB monthly bundle but use only 200MB in a typical month, there’s nothing to be gained by cutting back.

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It might be worth contacting your provider to see if you can save money by moving down to a 250MB allowance: even if you occasionally go over the lower limit, you may well end up saving money overall.For most of us, however, it’s more likely that we’ll be close to our data threshold, with consumption gradually growing as everyday services move online. Most providers will help you avoid going over your cap by sending you a text message when you’re getting close – but when a message such as this arrives, it’s too late to do anything other than pare your usage right back for the remainder of your billing period.One way to keep track of your usage is by logging on to your provider’s website every week or two and checking how much of your allowance remains. Some providers – including EE and Vodafone – offer their own apps for iOS and Android that can give you a running tally. You don’t need these, however: almost all phones (and 3G/LTE-equipped tablets) come with built-in software to track activity on mobile networks.This approach comes with a caveat, since on-device records may not precisely square with what your provider thinks you’ve used. This can happen, for example, if you’re in an area of poor coverage and your device is having multiple tries at sending and receiving data packets.

It’s conceivable that you could end up being charged for exceeding your limit even if your data monitor thinks you’ve stayed just within it. So it’s still a good idea to drop by your provider’s website every so often, to check whether its records have drifted significantly apart from yours.Android users will find the data-monitoring tool under Settings | Data Usage. It shows a graphical representation of how much mobile data you’ve consumed in any given month – tap the “Data usage cycle” dropdown to tell it the date on which your billing period starts – and if you scroll down, you’ll see a breakdown by app.When the Asus N56VM arrived in PC Pro’s Labs just over a year ago, it’s fair to say we were smitten. Sharp looks, good performance and a keen price delivered it straight to the A List. Twelve months on and Asus is hoping to repeat the trick with the similar-looking but better-specified N550JV.

The design has undergone a revamp, and the result is that a laptop that was already good-looking is now positively handsome. A backlit Asus logo glows in the centre of the metal lid, and the keyboard surround is topped with a layer of aluminium that pools between the backlit, Scrabble-tile keys and spills over and around the N550JV’s edges. Concentric, micro-drilled speaker grilles ripple outwards from the buttons embedded along the laptop’s top edge, and there’s a wide, silver buttonless touchpad beneath.The Asus’ 15.6in touchscreen is a peach: the glossy finish is very reflective, but thanks to the Full HD resolution, images and text are crisply presented and there’s plenty of desktop space. It’s technically competent, too. Brightness peaks at a respectable 335cd/m2, and the contrast ratio of 780:1 is solid. Colours lack a little punch next to the very best displays we’ve seen at this price, but accuracy isn’t bad, and while there’s a tendency to crush the darkest greys into black, our photographs looked natural and packed with detail. Our only other criticism is a more practical one: firm on-screen prods set the screen wobbling fairly eagerly, so it’s necessary to dab gently to get the best results.

We’ve no such qualms about the keyboard, however. It’s a solid example, and although the keys don’t quite offer the same level of crispness as Lenovo’s finest ThinkPads, there’s plenty of travel and a definite, unmistakable snap to every keystroke. The keys are backlit with a strong white LED, and the three brightness levels make it easy to get the lighting just so. The extra space afforded by the Asus’ 38cm wide chassis has been put to use too, with a numeric keypad squeezed in along the right-hand edge. Beneath, the buttonless trackpad is a fine example: its silky-smooth surface and wide dimensions make the most of Windows 8’s gestures, and the pad depresses with a solid, muffled click.AMD has previewed its updated processor platforms, unveiling Kaveri for desktop, as well as Beema for laptops and Mullins for convertibles and tablets.Aimed at high-end desktops and laptops, Kaveri is the follow-up to last year's top-of-the-line Richland series and marks AMD's first heterogeneous APU - where a CPU and GPU are housed on the same piece of silicon to boost performance and speed.Kaveri features either a dual- or quad-core Steamroller CPU, plus eight Graphics Core Next cores. It consumes between 15 and 35 watts, an improvement over last year’s Richland, which ate up between 17 and 35 watts.Further details weren't available, but AMD said the new APU is due in the first six months of next year and that it will demo devices at CES in January.

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The announcement comes after Intel admitted the follow-up to Haswell, Broadwell, is behind by about three months.AMD also unveiled Beema for laptops and Mullins for tablets and hybrid devices.They come in dual- or quad-core variants using AMD's new "Puma" processor cores.Beema will consume between 10 and 25W – better than Kabini, which consumed between 15 and 25W. Mullins, meanwhile, eats up as a little as 2W, a considerable improvement on last year’s Temash APU, which ate up between three and four watts.Both APUs are optimised for Windows 8.1 devices and AMD said it's working on providing native Android support in the near future.The new APUs are due to arrive within the first half of next year with demos and further details to follow at CES.Chief technology officer Mark Papermaster promised that AMD wasn't "standing still" when it came to breaking into mobile."AMD aims to deliver a set of platforms in the first half of next year that will outperform the competition in graphics and total compute performance in fanless tablets, two-in-ones and ultrathin notebooks," he said.

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