Not wanting to start a bash windows thread but I am completely amazed that the new late 2013 retina MacBook Pro laptops run SILENT under casual use. I've used a number of ultra books over the last couple of years and while some were quieter than others all ended up with the fan being heard after browsing the web or watching videos for a while. An Asus ultra book looked incredible but had an annoying whine to its fans and HP fans were very quiet but came on and off too often. Just amazed somehow Apple has found a way to completely silence these machines under normal light use. Is it just because of the Haswell processor, maybe Windows laptops using it are silent now too, but somehow I don't think so?