The S-331 Desktop is an ultra-compact desktop case with a volume of 8.3 liters, providing ample space for powerful office systems despite its compact dimensions. It accommodates a slim DVD drive with a height of 9.5 mm and either a 3.5-inch hard drive or up to two 2.5-inch SSDs, as well as low-profile cards up to 23 cm in length. For cooling the interior, there is a mounting space behind the front for an optional 80 mm fan.