This advanced enclosure comes equipped with features that will maximize your PC experience, from Quiet Computing™ panels & HDD drive bays, to grommet-lined cable routing holes with ample space behind the motherboard tray. The P280 accommodates motherboards up to XL-ATX and includes nine expansion slots to support up to four 13.0” / 330 mm graphics cards. And with convenient tool-less optical drive bays, easy-access front & bottom PSU intake air filters, two front panel USB 3.0 ports and an affordable price, you get an elite enclosure that will last you for builds to come. The P280 does not include a power supply. Make sure you choose a power supply that is compatible with your computer components and has a long enough power harness to reach your motherboard and peripheral devices. We recommend our High Current Gamer, High Current Pro or EarthWatts power supplies for the latest ATX specification compliance, broad compatibility, and power savings capability. At Antec, we continually refine and improve our products to ensure the highest quality. As such, your new chassis may differ slightly from the description in this manual due to improvements applied for the optimal building experience. As of November 15, 2011, all features, descriptions, and illustrations in this manual are correct. Disclaimer This manual is intended only as a guide for Antec’s computer enclosures. For more comprehensive instructions on installing the motherboard and peripherals, please refer to the manuals that come with those components. Table of Contents Section 1: Introduction 1.1 Getting to Know Your Chassis............................................................................5 1.2 Chassis Specifications.........................................................................................6 1.3 Included Screws .................................................................................................6 1.4 Before You Begin................................................................................................7 Section 2: Hardware Installation 2.1 Setting Up ..........................................................................................................9 2.2 Motherboard Installation...................................................................................9 2.3 Installing KUHLER H2O Liquid Coolers................................................................11 2.4 Power Supply Installation ..................................................................................12 2.5 External 5.25” Device Installation......................................................................13 2.6 Internal 2.5” Device Installation ........................................................................14 2.7 Internal 3.5” / 2.5” Device Installation ..............................................................14 2.8 Cable Management............................................................................................16 Section 3: Front I/O Ports 3.1 USB 2.0...............................................................................................................18 3.2 USB 3.0...............................................................................................................18 3.3 AC’97 / HD Audio Ports......................................................................................19 3.4 Power Switch / Reset Switch / Hard Disk Drive LED Connectors.......................19 3.5 Rewiring Motherboard Header Connections.....................................................20 Section 4: Cooling System 4.1 Included Fans .....................................................................................................22 4.2 Optional Fans .....................................................................................................22 4.3 Air Filters............................................................................................................24 Section 1 Introduction P280 User Manual Getting to Know Your Chassis 1. 3 x 5.25” tool-less drive bays 2. 2 x 2.5” drive trays (dedicated) 3. 6 x 3.5” / 2.5” drive trays 4. 2 x 120 mm top TwoCool™ exhaust fans 5. 1 x 120 mm rear TwoCool™ exhaust fan 6. 2 x 120 mm internal intake fans (optional) 2 x 120 mm front intake fans (optional) 7. 9 expansion slots 8. CPU cutout 9. Cable routing holes 10. Motherboard mount: XL-ATX, Standard ATX, microATX or Mini-ITX 11. Power supply mount / PSU intake filter 12. Front Ports (USB 3.0, USB 2.0, Audio I/O) Chassis Specifications Chassis Type Super Mid-Tower Chassis Color Black with aluminum door Dimensions 20.7” (H) x 9.1” (W) x 22.1” (D) 526 mm (H) x 231 mm (W) x 562 mm (D) Weight 22.3 lbs / 10.2 kg Cooling -2 x 120 mm top TwoCool™ exhaust fans -1 x 120 mm rear TwoCool™ exhaust fan -2 x 120 mm internal intake fans (optional) -2 x 120 mm front intake fans (optional) Drive Bays -3 x 5.25” tool-less drive bays -6 x 3.5” / 2.5” drive trays -2 x 2.5” drive-bays (dedicated) Expansion Slots 9: supp...