Apple has upgraded its range of MacBooks with Intel Core 2 Duo processors, with the new configurations immediately available across all sales channels.

The new chips mean the latest MacBooks are "up to 25 percent faster" than the preceding generation, the company claims. They continue to offer all the features that made first-gen models so attractive, including built-in iSight cameras, the MagSafe power adaptor and iLife '06.

Prices remain more or less the same, the entry-level model costs £749, while the mid-range price has fallen slightly, to £879 from £899. The most expensive black model has seen its premium on colour models fall by £30 to £999, with a hard drive that's 40GB larger than that of the mid-range model it is otherwise identical to.

The range includes three models: white 1.83GHz and 2.0GHz MacBooks and the 2.0GHz black model.

Apple has at last beefed up the amount of memory it ships as standard in these Macs, with 1GB of memory shipping as standard in all models bar the entry-level configuration, which still ships with 512MB.

The included SuperDrive (available in the mid-range and black model) has also been souped up, a double-layer optical drive now shipping as standard.

MacBooks also feature glossy screens, Apple's Sudden Motion Sensor, Scrolling TrackPad, built-in AirPort Extreme and Bluetooth 2.0+EDR networking, 10/100/1000 BASE-T Gigabit Ethernet, two USB 2.0 ports, a FireWire 400 port, combination analogue and optical digital audio input and output ports and a mini-DVI video output to connect up to a 23in Apple Cinema HD Display.