The Acer Aspire One D255 is a rather special netbook because it comes with a dual core Intel Atom processor, with each core running at 1.5GHz boasting 512KB of L2 cache. Similar to other Atom processors, the N550 will also support hyperthreading, resulting in Windows reporting that you will have a quartet of CPUs underneath the hood – even if in reality you don’t. The hyperthreading capability of this processor ought to go some way in giving you a performance boost when you’re doing some processor-intensive tasks or multitasking, although a lot of it also depends on the way the software is written in order to take advantage of hyperthreading capability.