i have sn25p and it quieter than my tower ,and now they have a lot fan options in bios.
my spec is fx57+7800gtx and 2 gig of ram +250 harddrive and 40 gig backup,it does not get noisy not like old shuttles when fan use to go up and down
.i hope it helps as well it is very good bit of kit ,onboard sound is very good as well