"You can always tell when people don't know what they're talking about."
Looking in the mirror again as usual.
"A dual fan PSU is not a problem. The reason it's not a problem is that the bottom fan does not blow out (and thus into the case). It blows into the PSU, which is then exhausted out the back of the case."
If a supply sees two fans then it draws in cooler air coming in from the twin 120s on the front of the case.
"A side fan is nice blowing inwards. It also doesn't hit the CPU, it blows on the VGA. Sitting one in the corner (like PC eye), doesn't qualify as experience with the case, nor does it qualify one to speak about one."
Little does someone know the 900 has been in use here for sometime now.
"I have a 120mm fan on the side and it works great in conjunction with the top and rear fans. It's certainly a good idea to have one there, although it makes for a good dust magnet."
With the 900 sitting inside a cabinet area there a lack of space along the sides for drawing air in while serving to force more out to work the front 120s. In an open are like on top of a desk the fan if one is used would otherwise be facing outward.
*waits for the inevitable PC eye last word and the "This message is hidden because PC eye is on your ignore list*
Three things in life are guaranteed. Death, taxes and the now infamous PC eye last word drivel.