I launched two separate browsers and opened around 25 tabs in each, alongside the Skype desktop client and the Kindle app. It was difficult to really push the Surface Pro 4 by opening programs and apps on the desktop. The model supplied to T3 for review ran the 64-bit version of Windows 10 and housed an Intel Core i5-6300U backed up by 8GB (configurable up to 16GB) of DDR3 memory, paired with a 256GB SSD (configurable up to 512GB) for storage and Intel HD 520 graphics. Core m3's benefits from featuring no mechanical parts and runs whisper quiet, while being marginally thinner. At the lower end it comes with Intel's Core m3 processor, a passively-cooled Skylake CPU that's less powerful the Core i5 and Core i7 chips inside the more expensive Surface Pro 4 models. Microsoft is offering the Surface Pro 4 in six different configurations, depending on how much power you need under the bonnet. Communication options include 802.11ac Wi-Fi and Bluetooth 3.0. The Surface Pro 4's ports include one USB 3.0 port, DisplayPort, a microSD card reader and a headphone/mic combo jack.

Handily, the new Surface Pen clips to the left-hand side of the display magnetically for storing away when not in use.

Microsoft calls the technology 'PixelSense', and it makes writing or drawing with the pen feel more natural. At the same time it has reduced the gap between the sensors under the Surface 4's display and the glass panel above it. Microsoft has also upped the Pen's sensitivity from 256 to 1,024 levels of pressure. It's a silver slate that'll send your magpie tendencies into overdrive - just don't expect its front side to remain free of fingerprints for too long. The Surface Pro 4's sturdy magnesium-alloy chassis makes it unmistakably a Surface device, only this time around it's thinner (8.4mm versus 9.1mm), lighter (1.73 pounds versus 2.4 pounds) and features a silver Microsoft logo on the back rather than the Surface logo. Microsoft decided to refine the Surface Pro 3's design rather than change it completely. Microsoft Surface 4 vs iPad Pro: the new super-tablet battleground.If you're seeking more bang for your buck, Microsoft's Surface 3 (£509 with a keyboard) and Lenovo's upcoming IdeaPad Miix 700 (expected to launch at around £500) are two wallet-friendly convertibles cut from a similar cloth as the Surface Pro 4. That places it in the same ballpark as HP's similarly luxurious Spectre X2, which starts at £849.99. Meanwhile, the cheapest model, which houses Intel's Core M processor, starts at £749 (£859 including a keyboard). Coughing up £1,909 fetches you the top-end Surface Pro 4 kitted out with all the bells and whistles (including the new £110 Surface Pro 4 keyboard). If you're looking for a budget tablet, the Surface Pro 4 isn't it.

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