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.

Mac Cleaning Software Recommended Mac Cleaning Software: See CleanMyMac 3 in action on your Mac ( Try it free ). It has all the tools to take care of your system. Full cleaning, optimization, health monitoring, and even more to help your Mac run at full speed. You can uninstall unwanted apps, fix system errors, and improve performance — just in a few clicks. During a full scan with CleanMyMac, the average user finds about 74 GB of junk to clear out. Reclaim more free space on your hard drive and make your Mac as good as new.