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May 01, 2017

Toshiba PA3615U-1BRM laptop battery

Claimed network speeds should also be taken with a pinch of salt, but here EE again has the upper hand. The company claims its "double speedâ€ 4G network â€“ live in around 20 of the 200 towns and cities that its 4G network covers â€“ provides a maximum download speed of 60Mbits/sec and an average of 20Mbits/sec.Vodafone is coy on the speed of its network, claiming that itâ€™s "typically six times faster than Vodafone 3G, based on a pre-launch networkâ€, but never using headline figures in any of its material. O2 is equally modest, claiming that 4G is five times faster than its 3G, but keeping mum on average or maximum speeds. Three is also tight-lipped, but spoke of an average download speed of around 12Mbits/sec at the time of its 4G launch.It seems the networks are, at last, being cautious when it comes to trumpeting headline speeds, after many failed to live up to the wild speed claims made about their 3G networks. Weâ€™ve recorded 4G download speeds of up to 40Mbits/sec on three different networks in central London and Sussex, with uploads of between 10Mbits/sec and 15Mbits/sec. The networks appear to be underplaying their hands at present, although speeds may slide as 4G handsets become more widely used and congestion increases.

Analysts believe that the amount of spectrum EE has been able to allocate to 4G (more of which below) has also given it a performance edge over its rivals. "The capacity EE has, what itâ€™s done with the double speed, and the ability to reallocate more of the 1,800MHz band towards 4G services, has given it an advantage,â€ said CCS Insightâ€™s network operator specialist Kester Mann. "EE is certainly leading in terms of speed.â€Thereâ€™s an element of "how longâ€™s a piece of stringâ€ to this question, because 4G coverage varies depending on location (see How to check your coverage, below). However, there are crucial differences in the coverage and 4G spectrum used by the networks that could sway your decision if youâ€™re in the fortunate position of having a choice of networks serving your home or office.While the required specs have changed significantly since then, the emphasis has always been the same: for slim, lightweight laptops that have great battery life. And, as youâ€™d expect of a standard created by Intel, certain key components (think processor and wireless radio in particular) have to be made by the company too.

The end result is a stream of excellent, high-quality laptops from the top manufacturers for the past three years: if a laptop has an Ultrabook badge on it, you can be reasonably certain itâ€™s going to live up to even high expectations.Take speed. Every new Ultrabook needs to have one of Intelâ€™s recent, fast processors inside (to be precise, the "Haswellâ€ version of its Core processor range), while the storage must meet an 80MB/sec transfer rate minimum. In reality, all the Ultrabooks we see now include SSDs inside, which means retrieving files is fast even if you donâ€™t have as much storage space as a traditional, mechanical hard disk. See also: The best laptops of 2014 All the screens we now see in Ultrabooks are top-notch too. Whether itâ€™s a 13in, 14in or 15in model, you should expect Full HD resolutions.Most Ultrabooks now also include touchscreens to take advantage of Windows 8, while you should also look out for high-end Wi-Fi. We recommend 802.11ac to match the latest routers, if you can afford it.

We run independent battery rundown tests to check manufacturersâ€™ claims, but weâ€™re pleased to say that this is no longer the issue it used to be. If you buy an Ultrabook, you can be confident that it will last almost all the working day (providing you donâ€™t indulge in over-intensive tasks, such as video editing). The downside is that the battery is likely to be integrated into the body, which is the payback for such slim designs.Samsung has long been a champion of the Chromebook. Since releasing the very first commercially available model back in 2011, it's been steadily trickling out new models, despite a lukewarm reception from consumers. The Samsung Chromebook 2 is the latest to roll off the production line. Read on for our in-depth Samsung Chromebook 2 review In fact, there are two models of Chromebook 2: the one we have here, which has an 11.6in screen with a resolution of 1,366 x 768, and a 13.3in version with a 1080p screen, which we'll be reviewing in the coming weeks.Whichever you choose, you'll get a very similar-looking device. As with many Samsung products, the build is unapologetically plastic, but it isn't an eyesore. The lid is finished with a grippy soft-touch compound, patterned to look like leather, and there's faux stitching around the edge to top things off. On the inside, a shinier, semi-matte plastic surrounds the Scrabble-tile keyboard, and a tasteful chrome-effect trim surrounds the touchpad.

It doesn't feel flimsy, and it's extremely light. Tipping the scales at just over a kilogram, the 11.6in Chromebook 2 is a laptop you can carry around all day and hardly know it's in your bag. It's certainly a more elegant device than the Dell Chromebook 11, which is more brutish than beautiful.And despite the slim profile, Samsung has still found room to include one USB 2 and one USB 3 port so you can connect hard disks and thumbdrives, plus a full-sized HDMI output for connecting a second monitor or TV. It's a little disappointing that there's no full-sized SD card slot, but you do at least get a microSD slot, allowing you to add to the existing 16GB of internal storage.However, this is a machine that's happiest away from the encumbrance of wires and cables, and in such an environment it performs admirably. We're encouraged to see 2x2 stream 802.11ac Wi-Fi on board, and ergonomically it's spot on. The keyboard doesn't feel particularly positive, but we got up to speed on it quickly, and we can't fault the layout. The touchpad is large enough to ensure Chrome OS's two- and three-finger multitouch gestures are easy to perform. It's a buttonless touchpad, which isn't ideal, but it is reliable, and clicking doesn't cause the cursor to jump around the screen.

The Samsung Chromebook 2's 11.6in screen isn't a high point, unfortunately. There isn't anything particularly wrong with the resolution, and we like the anti-glare, semi-gloss finish, which keeps reflections to a minimum, but it isn't very bright. We measured it at 200cd/m².To make matters worse, contrast is low, and vertical viewing angles are narrow. It's no better than the far cheaper Dell Chromebook 11, and is outdone by the HP Chromebook 11, which has a brighter, much punchier IPS screen.Performance is disappointing as well. We've become used to the snappy performance of Intel's Haswell-class Celerons in recent Chromebooks, but inside the Chromebook 2 is an ARM-designed, Samsung-manufactured Exynos 5420 SoC.This is one of Samsung's octa-core processors: it has four 1.9GHz Cortex-A15 cores for heavy duty jobs, and another four 1.3GHz Cortex A7 cores for light duties. Alas, it just doesn't feel as zippy in use as the Intel-based Chromebooks do. It doesn't wake up quite as quickly from sleep, taking two or three seconds each time you open the lid before the screen comes alive.

And once you have more than a handful of tabs open things begin to slow down further. A result of 659ms in the SunSpider JavaScript benchmark shows it isn't as fast in a straight line as Intel's processors, either, with the Dell achieving 323ms.Still, you may well be willing to put up with the occasional pause or stutter, given how good the battery life is. When looping a cached 720p YouTube video with Wi-Fi turned off and the screen set to 120cd/m2, the Chromebook 2 lasted a significant 7hrs 39mins, almost two hours longer than the lifespan of the Dell Chromebook 11. That's enough to bump up the Samsung's Performance rating a notch.The Samsung Chromebook 2 does an awful lot of things right. It's well designed, if a little plasticky, light and well equipped, and battery life is excellent.Yet, with that lacklustre screen, slightly sluggish performance and a price tag that makes it one of the more expensive 11.6in Chromebooks on the market, it doesn't do quite enough to gain our wholehearted recommendation.Good news, we said - not great news. Last year, the global PC market slid 9.5%, and this year, it will only slump by 2.9%.

"2014 will be marked by a relative revival of the global PC market," said Ranjit Atwal, research director at Gartner. "Business upgrades from Windows XP and the general business replacement cycle will lessen the downward trend, especially in Western Europe. This year, we anticipate nearly 60 million professional PC replacements in mature markets."Tablet sales will slow - as rival analysts have also predicted - but still increase by 24% to reach 256 million units shipped globally this year. "The next wave of adoption will be driven by lower price points rather than superior functionality," predicted Atwal.The latest round of compact tablets are already coming in at £120 starting prices - such as the Asus Memo Pad 7 - with some dipping below the £100 mark.All of that said, desktop PCs and laptops continue to sell more in total numbers than tablets - though that's somewhat confused by how to label hybrids. However, tablets look set to overtake standard PCs by next year.Despite the XP-induced rebound, Microsoft's share of the total device market - including smartphones - by OS will grow by less than a percentage point over the next year, as Google's Android and Apple's iOS and OS X continue to win in tablets.

Microsoft's OSes nabbed 14% of the total device market - smartphones, tablets, laptops and PCs - in 2013, will slide to 13.7% this year, and are predicted to rebound to 14.4% next year. Android, meanwhile, is posting 30% growth, while iOS will see a 15% increase, Gartner said.While it's somewhat unfair to compare an OS that's predominantly on PCs and laptops to those found on cheaper tablets, the stats highlight Microsoft's troubles pushing into the tablet market.Plus, the analyst firm is also including Windows Phone, and predicted that OS will more than double its market share from 4% globally this year to 10% by 2018.There are new seeds for Xcode 6, the integrated development environment (IDE) for OS X and iOS, OS X Server 4, and Apple Configurator 1.7, which allows mass configuration of iOS devices.Swift, Apple's new programming language for OS X and iOS, also has some updates. According to the official Twitter account, the command line tool has been updated for easier scripting, and ranges have been significantly updated.Users can also choose to show full URLs in Safari, while the appearance of the volume and brightness controls have been slightly altered.The UI for the calculator app, which was given an overhaul in Developer Preview 4, released on 22 July, has also been tweaked, making it more transparent than it was previously.

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