Cooler Master Elite 331

The Elite 331 has four 5.25" slots and seven 3.5" slots. Like the 330, the slots do not require tools to access. The 331 includes a built-in washable front air filter, but does not include a power button backlight. The case is compatible with ATX and micro-ATX motherboards. It is a step up from the Elite 310, and very similar to the 330 but with a different style.