Some of the Atoms have hyper-threading and SSE4, only a select few of Penryn duos had SSE4 and none hyper-threading. A atom 330+ION ITX outperforms a Penryn based duo laptop with a Nvidia 9xxx or 1xx chip. Also a desktop with IGPU. Avira still does better than KIS and GDATA for me on any hardware. NOD32, Norton, McAfee etc have crapped out and failed on detection for me over the years. I have a serious problem with bloat-wear anyway, it indicates careless developers. Panda, Norman, Dr.Web are also good IMO.