Top 10 energy efficient desktop PCs

7 Tranquil T2e Atom
£428
29 watts
A living room-friendly desktop, this fanless machine is reportedly very quiet too. You can customise it as you like, but for this money you get a pretty decent dual core Intel processor, 80gb hard drive, Windows XP Home and 512mb RAM. You'll probably want to pay a little extra to bump the RAM up.