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1 month warranty from the date of purchase on the siteç½ç«è´ä¹°æ¥æèµ·ä¿ä¿®ä¸ä¸ªæGrade A= few almost invisible marksGrade A= pochi segni quasi invisibiliGrade A=æå°è®¸ç»å¾®å®çDisplay27-inch (diagonal) LED-backlit display with IPS technology; 2560-by-1440 resolution with support for millions of colorsProcessor3.2GHz3.2GHz quad-core Intel Core i5 processor (Turbo Boost up to 3.6GHz) with 6MB L3 cache3.4GHz3.4GHz quad-core Intel Core i5 processor (Turbo Boost up to 3.8GHz) with 6MB L3 cacheConfigurable to 3.5GHz quad-core Intel Core i7 (Turbo Boost up to 3.9GHz).Memory8GB (two 4GB) of 1600MHz DDR3 memory; four user-accessible SO-DIMM slotsConfigurable to 16GB or 32GB.Storage1 1TB (7200-rpm) hard driveConfigurable to 3TB hard drive, 1TB or 3TB Fusion Drive, or 256GB, 512GB, or 1TB of flash storage.Graphics3.2GHzNVIDIA GeForce GT 755M graphics processor with 1GB of GDDR5 memory3.4GHzNVIDIA GeForce GTX 775M graphics processor with 2GB of GDDR5 memoryConfigurable to NVIDIA GeForce GTX 780M with 4GB of GDDR5 memory.Video Support and CameraFaceTime HD cameraSimultaneously supports full native resolution on the built-in display and up to a 30-inch display (2560 by 1600 pixels) on an external displaySupport for extended desktop and video mirroring modesSupport for Target Display Mode via the Thunderbolt port using a Thunderbolt to Thunderbolt cable (sold separately)AudioStereo speakersDual microphonesHeadphone portHeadphone/optical digital audio output (minijack)Support for Apple iPhone headset with microphoneConnections and ExpansionSDXC card slotFour USB 3 ports (compatible with USB 2)Two Thunderbolt portsMini DisplayPort output with support for DVI, VGA, and dual-link DVI (adapters sold separately)10/100/1000BASE-T Gigabit Ethernet (RJ-45 connector)Kensington lock slotWi-Fi802.11ac Wi-Fi wireless networking;2 IEEE 802.11a/b/g/n compatibleBluetoothBluetooth 4.0 wireless technologySize and WeightHeight: 20.3 inches (51.6 cm)Width: 25.6 inches (65.0 cm)Stand depth: 8 inches (20.3 cm)Weight: 21 pounds (9.54 kg)3 Electrical and Operating RequirementsLine voltage: 100-240V ACFrequency: 50Hz to 60Hz, single phaseOperating temperature: 50 ° to 95 ° F (10 ° to 35 ° C)Relative humidity: 5% to 95% noncondensingOperating altitude: tested up to 10,000 feet
