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Buyer's Guide: 15in Notebooks

How to select the machine that's right for you

Security for virtualized datacentres

Group Test In this group test I'm comparing six models that have a 15.6in screen with a decent, 1366 x 768 resolution that supports HD video - look for an HDMI port if you want to hook it up to a telly.

A mid-size 15.6-inch chassis gives you free rein to choose either a dual-core or quad-core CPU. Intel rules the roost with its Core i3 and Core i5 processors, which are both two-core parts with HyperThreading to make them appear as four to the host operating system - handy for a small performance boost.

Core i3 runs at a fixed peak clocks speed, but Core i5 uses TurboBoost to up the clockspeed if it can do so without overheating chip and system. Having said that, the AMD Phenom II has decent performance too, and shouldn't be overlooked, but it is unlikely that you will see any significant benefit from having four CPU cores instead of two.

Dell Inspiron 15R

When it comes to the choice of graphics chip, most Intel CPUs come with the chip maker's GMA HD graphics built in. These cores deliver enough grunt to power the Windows Aero desktop and HD video but not serious gaming. If your play is more casual, the Intel silicon will stand you in good stead and will help deliver the best battery life - though, to be honest, if it's battery life you're after, a 15.6in machine may not be for you.

If you are going to play the latest games, you'll need a proper GPU under the bonnet and that means a member of the AMD's DirectX 11-enabled Mobility Radeon HD 5000 family. At present, AMD's graphics rival, Nvidia, has very little to offer that can match Radeon in the mobile market.

You can expect that your mid-sized laptop will come with a multi-format DVD writer as standard, but Blu-ray is often provided as an option, though it'll push up the price if you take it - more if you want to write BDs too.

Windows 7 is the OS of choice for any new laptop. Reg Hardware recommends the 64-bit version of the OS, and all the machines I've looked at here come with that release. If you buy a machine with 32-bit Windows, bear in mind that the OS will only be able to access up to 3GB of memory.

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