Straight forward question: Where are boosta and boostb? Looking at the list, I assume PCI is the one in the center, PS is Power Supply, Intake is the lower front bigger fan in front of the tray, Exhaust is exact opposite, but I had no idea there were more than that. When I crank them up to 5200rpm, I hear them, but relative to the others, they are very quiet. I couldn't find a diagram online either. Every time I search for them on google images, I just keep seeing the main aforementioned fans. Could a fella have some help?