Ok, If any of you don't believe me, then read this quote from pc world :

"When used for long periods of time, the base will get a little warm, but it won't be enough to make you feel uncomfortable, unless you are constantly running programs that require a lot of CPU or graphics power. There is a cooling fan installed in the rear of the chassis, and it kicks in when the CPU or graphics adapter is under a heavy load; it's a relatively loud fan and it can get annoying if you are using the laptop to crunch heavy workloads while you're in a quiet room." Pc World

Source :

http://www.pcworld.idg.com.au/review/noteb...819#info_bottom

EDIT : You can guess that I posted my own personnal review under the user name "Kokakolia"

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Added on March 27, 2011, 10:00 amAnother quote from the notebookreview forum :

"The SB is definitely louder on a full load. Remember that the SB has 2 sound emitting devices if you don't count the DVD drive (the fan and the HDD). The Z only has one (fan), because its SSD runs silent. As mentioned above, the SB sounds like a washing machine when gaming. The Z can just be described as moderately noisy (and relatively quiet compared to the SB)" Brianho1337

Source : http://forum.notebookreview.com/sony/56348...-vaio-sb-4.html

i got to play with new SB earlier today. what a spectecular sight! its slim n as expected, the magnesiun allow are both beautiful to see n hold

maybe bcoz of the slim design the fan need to work extra hard hence extra noisy to keep it cool.weird tho, my last gen sr55 also kinda slim but also quiet..

if only it got more beefier gpu then 6470. sigh..thats the only thing keeping me from owning one