21.5-inch (diagonal) 4096-by-2304 Retina 4K display
3.0GHz 6-core 8th-generation Intel Core i5-8500
AMD Radeon Pro 560X graphics
Ultrafast 8GB RAM 256GB SSD storage
Two Thunderbolt 3 (USB-C) ports
Four USB-A ports
Gigabit Ethernet port
FaceTime HD camera
802.11ac Wi-Fi and Bluetooth 4.2
The iMac "Core i5" 3.0 21.5-Inch Retina 4K features a 3.0 GHz Intel "Core i5" processor (I5-8500) with six independent processor "cores" on a single chip, a 9 MB shared level 3 cache, 8 GB of 2666 MHz DDR4 SDRAM that is reportedly "built into the computer" -- but it actually can be upgraded later, it is just needlessly difficult -- a 256 GB SSD standard and a Radeon Pro 560X graphics processor with 4 GB of dedicated GDDR5 video memory. It also has a built-in "FaceTime HD" webcam and stereo speakers.
This model has a 21.5" 4096x2304 LED-backlit 16:9 widescreen IPS DCI-P3 "Retina 4K" display (that runs "pixel doubled" to look like 2048x1152). The rear of the case is aluminum and is thicker in the middle and tapers to a razor thin 5 mm at the edges.
Connectivity includes four USB 3.0 ports, dual Thunderbolt 3 (USB-C) ports, Gigabit Ethernet, 802.11ac Wi-Fi, and Bluetooth 4.2. It does not have a T2 chip.
Compared to its predecessor, this model is very similar externally and internally, but it has a more advanced processor and architecture as well as graphics processor.
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