The Grandia GD04 is an incredible product that combines years of Silver Stone expertise in SFF (Small form factor) & HTPC (Home Theater Personal Computer) chassis design. It has a beautifully proportioned exterior & powerful thermal capability that rivals the best tower chassis. From the front, the GD04 is shaped similarly to most home theater components, but the depth was reduced to a mere 323mm. This overall size of 21.5 liters in volume actually makes the case one liter smaller than Silver Stones own Micro-ATX Sugo cases! Even though GD04s diminutive size allows it to easily integrate into any home theater cabinet, it can still accommodate an impressive list of standard components such as 5.25" optical drive, two 3.5" hard drives, a 2.5" SSD, a standard ATX power supply, & two high-end graphics cards. Cooling duty in the GD04 is handled by three filtered 120mm fans designed with the same positive air pressure as the Fortress FT01, this enables class-leading cooling efficiency, reduced dust buildup, & silent operation. To make installation simpler, there is even enough space for cable management to be easily accomplished without the need for short cabled or modular power supply. Coupled with special attention given to the order of installation, any user can quickly assemble or upgrade the GD04 & devote more time to enjoying a personalized digital life with an HTPC. Three silent 120mm fans included Positive air pressure design for excellent cooling/quietness & dust-prevention Thick 8.0mm aluminum front panel with premium styling Incredible 323mm depth to fit comfortably inside home theater cabinet Designed with cable routing for easy installation Support power supply up to 180mm long Support expansion cards up to 11 inches Support 2.5” hard drive or SSD (Solid-state drive) Model No. SST-GD04B (Black) SST-GD04S (Silver) SST-GD04B-USB3.0 (Black) -- Material 8.0mm aluminum front panel, 0.8mm SECC body Motherboard Micro-ATX, DTX, Mini-ITX Multimedia -- Drive Bay External 5.25" x 1 -- Internal 3.5" x 2, 2.5" x 1 or 3.5" x 1, 2.5" x 2 Cooling System Front -- Rear 2 x 80mm fan slots (optional mounting) Side Right: 2 x 120mm intake fans, 1200rpm, 20d BA Left: 1 x 120mm intake fan, 1200rpm, 20d BA Also compatible with 80mm fan Top -- Bottom -- Internal -- Expansion Slot 5 Front I/O Port USB (Universal Serial Bus) 2.0 x 2 (SST-GD04B, SST-GD04S only) USB (Universal Serial Bus) 3.0 x 2 (SST-GD04B-USB3.0 only) audio x 1 MIC x 1 Power Supply Support standard PS2 (ATX) Operating system support -- Expansion Card Support graphic cards up to 11 inches. Limitation of CPU cooler 70mm (remove ODD if you want install up to 120mm) Limitation of PSU 180mm (remove Left fan replacement as 80mm if you want install up to 220mm) Net Weight 5.54kg Dimension 440 mm (W) x 150 mm (H) x 323 mm (D)