Someone actually had a great idea to improve airflow over the hs:
http://forums.silentpcreview.com/viewto ... highlight=
Anyway...it's 92mm fan, the case/shroud fan, that is.
My 80mm psu fan started to get really noisy after a while (computer on 24x7) and the 92mm fan, too. Replaced psu fan w/Nexus 80 mm, but still was somewhat noisy at 12v, but okay at 5 volts. Maybe stock fan is okay at 5 v, too.
Taking out the grill vents at the back will probably help, but didn't do it for future prying-baby-fingers safety considerations.
Sux that I dunno how hot the temps are since dell's m/b don't to temp readings and now that I have 3 HDD.....along with 1CDROMand another 1 DVD drive.
Anyway, to answer your question, the 8300 can
be quite noisy.
Although I heard that some people called dell to warranty-replace the case/shroud fan for something much more silent.