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• Saturday 2 December 2017 - Fujitsu LifeBook S781 Battery www.all-laptopbattery.com

Network provision is an interesting one, and is something you'll have to work at to get right. The reason for this is that the provider of your leased line or internet connection isn't necessarily the same as the provider that puts in the physical link.Some big-city data centres flaunt the fact that they have a couple of dozen different net providers in their premises and that you can choose which you wish: while that's true, there weren't a couple of dozen different providers digging up the road and burying cables – the “local loop” or “last mile” will generally be provided by one of a small number of actual telcos who are wholesaling their services to the smaller providers.So when you're looking at a data centre premises, ask the network providers whether it's their cable or someone else's.Why is this important? Simple: if you've got any sense you'll use diverse connectivity into your data centre: there's no point signing up to (say) a primary link from COLT and a secondary from BT if in fact the “last mile” of the COLT link is actually provided by BT and goes through the same exchange as the primary.This isn't to say you can't use this type of supplier – just that before signing up you need to speak with the providers and make sure you're able to get properly diversely routed links regardless of the reseller arrangement behind the scenes.

Security in data centres is a pain in the backside, and rightly so. If you're being shown round a data centre by your prospective supplier and it's easy to get in, you should walk away.Data centres should have CCTV inside and out, with the images easy to view, and on entry you should need to show photo ID and be listed on the provider's formal access list.You should have access only to the areas where your cabinets are located (and the communal rest/refreshment/toilets areas, of course) and if your cabinets have keylocks (as opposed to combination locks, which are preferable) you should have to sign the keys in and out. The provider should be able to give monthly reports on entry and exit for every visitor.Check out the Goods Inwards area too. If you purchase equipment for the data centre it's likely to be bulky, so you'll have it delivered straight to the data centre – you'll therefore want reassurance that it's stored securely and nobody else can access it. You should have to sign for it to release it from the storage area – preferably on an electronic system for ease of reporting.

Finally, I've already mentioned that there should be a build area and that you shouldn't be allowed to take boxed kit into the main hosting area. There should be clear rules about this, along with obvious things like not eating or drinking. The data centre provider should also be super-strict with regard to the kit you're installing and the power it consumes.We'll talk about why the vendor should care so much about power in another feature, but if they let you install your stuff without checking its consumption then you're allowed to wonder just whether they care about things like cooling capacity and the possibility of power overload.

Being a lightweight budget machine, there’s no disc drive and no HDD, just 32GB of flash storage. Or 17GB after system grab. That’s far from ideal but the full depth SD card slot takes the sting out. And anyway, the majority of Chromebooks have only 16GB of storage to start with.Combo audio, USB and volume, power. Note 'foot' (right) to keep keyboard off surface when used as a tablet Being a convertible machine there is hinge aplenty. Lenovo Yoga style, the screen can be folded right back on itself to form a fully-fledged tablet. Granted, bending the thing in half this way leaves the keyboard exposed but once the lid has passed 180 degrees the keys are disabled. The hinge mechanism is ideally weighted and feels well screwed together.

Five rubber feet on the deck keep the keys clear on the surface when you are using the keyboard as a stand.What’s the screen like? Not half bad, actually. It has a resolution of 1366 x 768 which is fine for this sort of panel size and it is reasonably bright. Viewing angles are about what I expected for the sticker price; not great but not bad either. The panel is a bit reflective, but that’s true of many of laptop displays.I’ve no complaints about how the 10-point multitouch screen works. Taps, touches and drags were all recognised and executed first time… the vast majority of the time. The panel itself feels more glass than plastic and is impressively solid – the give around the Windows logo proving a decidedly localised affair. Judging by the lack of smudges after a few days' use it would appear to have an oleophobic coating too.The keyboard itself is also rather good. Apparently, it’s 97 per cent full-size, which means it feels as near as dammit actually full size. There’s no backlight, which came as no surprise, but there is a caps lock light. The keys themselves are easy on the eye and finger and have a clean, precise action.

I only demand three things of a touchpad. That it is large, central and works. The x360’s ticks all three boxes so let’s move along.Under the x360’s bonnet you’ll find an Intel Celeron dual-core 2.16GHz N2840 chip with 2GB of RAM. That’s a modern and efficient enough chipset but clearly no powerhouse. But when combined with Windows 8.1 and an SSD it makes for a fluid and prompt user experience.This side of hardcore 3D gaming or editing HD video files there’s not a lot the x360 can’t do with an acceptable level of dispatch. More to the point, nothing else for a similar price is any faster.That’s the only obvious change to the design of the MacBook Pro for 2015, which in most other respects looks identical to last year’s model – and the two years before that as well. Even so, the 18mm thick aluminium case looks as smart as ever, and at just 1.58kg it can still give most of its Windows Ultrabook rivals a run for their money.There’s no change to the 2560x1600 resolution of the 13.3-inch MacBook Pro with Retina display (WRD) either, but that resolution is still more than adequate for a screen of this size, and its bright, bold colours remain a treat for the eyes – even if the glossy screen coating is sometimes annoyingly reflective.

The Excavators have more gates than the Steamrollers, too, mainly to add in support for Intel Haswell instructions. Steamroller versus Excavator ... Fine until you hit 20W per core pair (click to enlarge) The shrinkage is possible by using GPU-style metallization. The wires connecting up gates in CPU cores tend to be fat and tapered – ideal for transmitting signals at high frequency in serial. GPU cores process data in parallel at a lower frequency, using networks of thinner wires to trade speed for parallelization. By shifting the x86 core over to thinner, GPU-like stacks of metal interconnects, AMD says it can save a lot of space while still providing enough performance for laptops: a five per cent increase in instructions executed per cycle and up to 40 per cent less power consumed than the previous generation.We've taken the high-density design library of the GPU, and applied it to the CPU. This has squeezed the design down in terms of power and area, Sam Naffziger, the AMD corporate fellow who oversaw the power management of Carrizo, told The Register.

The level two (L2) cache for the cores has been halved, since Kaveri, to 1MB, leaving more die space for other hardware. The per-core L1 cache has been doubled to 32KB, and the on-chip buffers and FIFOs have also been increased.The [L2] cache doesn’t consume a lot of power, and halving it makes more die area available. 1MB is good enough for most applications, Naffziger added.The GPUs and CPUs are better than Kaveri at dealing with temporary noise on their supply voltage, we're told: rather than demand an over-voltage to cope with any wobbles in the supply, the chip can, within less than a nanosecond, respond to any drops below the minimum threshold by scaling back clock frequencies and consume less power – in other words, gracefully cope with the supply droop.If you'll forgive the slightly clumsy metaphor, when driving over bumps in the road, you can either use expensive suspension to absorb the shocks, or slow down. AMD's Carrizo prefers to hit the brakes, but its engineers say this is good for power consumption overall: it avoids running all the time with an excessive Vdd voltage that is a waste of power when the supply is good.

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