Apple's Mac mini, which the company claims is the world's most energy efficient desktop, has been given a speed bump, more storage and double the memory.

With pricing from £499, the entry level Mac mini features a faster 2.26 GHz Intel Core 2 Duo processor and 2GB of DDR3 RAM, a 160GB hard drive, five USB 2.0 ports, FireWire 800, NVIDIA GeForce 9400M integrated graphics and a SuperDrive.

The £649 Mac mini features a 2.53 GHz Intel Core 2 Duo processor, 4GB of memory and a larger 320GB hard drive.

In addition, Apple now offers a £799 Mac mini that is specially configured with Mac OS X Snow Leopard Server and gets two 500GB hard drives for a total of 1TB of server storage in the 6.5-inch square by 2-inch tall package.