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You can cost-effectively upgrade a number of components in the iMac Intel 27" Retina 5k.
- Memory: If your iMac is still running with only the stock RAM, upgrading will provide a dramatic performance boost at minimal cost. Upgrading to the maximum of 32 GB (four 8 GB modules) is simple and provides unmatched performance.
Released October 16, 2014, the iMac 27" EMC 2806 features a Retina 5K display. It can be identified by its model number A1419 and EMC number 2806, both of which are located beneath the single foot.
In 2015, Apple offered a lower-spec, less expensive alternative to the 2014 model, with a 3.3 GHz Core i5 processor.
In late 2015, Apple offered the EMC 2834 featuring a a 14-nm "Skylake" Quad Core 4.0 GHz Intel "Core i7" processor.
Announce Date: October 16, 2014
Model Number: A1419
Developer: Apple Inc.
Operating System: OS X Yosemite
Processor: The EMC 2806 features a 3.5 GHz quad-core Intel Core i5 (Turbo Boost up to 3.9 GHz) or 4.0 GHz quad-core Intel Core i7 (Turbo Boost up to 4.4 GHz) both by Haswell. The 2834 features a 4.0 GHz quad-core Intel Core i7 processor by Skylake.
Display: 27-inch (diagonal) Retina display with IPS technology; 5120‑by‑2880 resolution with support for millions of colors
RAM: 8 GB (2x4 GB) of 1600 MHz DDR3 RAM, four user-accessible SO-DIMM slots customizable up to 32 GB
Storage: 1 TB Fusion Drive (7200 RPM), Configurable to 3 TB Fusion Drive or 256 GB, 512 GB, or 1 TB of flash storage (SSD)
Graphics: AMD Radeon R9 M290X graphics processor with 2 GB of GDDR5 memory configurable to AMD Radeon R9 M295X with 4 GB of GDDR5 memory on the EMC 2806. AMD Radeon R9 M390 or AMD Radeon R9 M395 graphics processor with 2 GB of dedicated GDDR5 memory on the EMC 2834.
Ports: Four USB 3.0 ports, two Thunderbolt 2.0 ports, one SDXC slot, gigabit Ethernet port, headphone jack/optical digital audio output
Connectivity: 802.11ac Wi-Fi, IEEE 802.11a/b/g/n compatible, and Bluetooth 4.0