The most feature-rich in the trio of Lian Li's new mini-ITX Q-series cases is the PC-Q18. It is designed for performance desktops and HTPCs. Measuring 199 x 290 x 365 mm (WxHxD), the PC-Q18 is designed keeping in mind the need for a performance machine to be airy, and is hence complemented with large fans. It can hold a mini-ITX form-factor motherboard with two full-height add-on card bays, hence having the ability to hold a double-slot graphics card.

Storage features include one 5.25-inch drive bay, which is valved; four (yes, four!) hot-swap capable 3.5-inch drive bays, with drive caddies that are so designed to accommodate up to three 2.5-inch drives. It has room for a 140 mm front-intake and a 140 mm top exhaust. Front-panel connectivity includes audio and USB 3.0. The chassis is made almost entirely of aluminum.