Apple has just refreshed the entire iMac lineup. The company has replaced all the previous 27-inch models with the 5K models and the 21.5-inch range gets a new 4K model.
The 21.5-inch range now consists of three models. The base 1.6GHz (Turbo Boost up to 2.7GHz) dual-core Core i5 model and middle 2.8GHz (Turbo Boost up to 3.3GHz) quad-core Core i5 model still have the 1080p IPS display. The top of the line 3.1GHz (Turbo Boost up to 3.6GHz) quad-core Core i5 model however now gets a 4K IPS display. All three models have 8GB 1867MHz LPDDR3 RAM and 1TB 5400-rpm hard drives. The base model has Intel HD Graphics 6000 whereas the middle and 4K models have Intel Iris Pro Graphics 6200. The rest is similar to the previous generation models. The prices are $1099, $1299, and $1499, respectively.
[Update: The resolution on the 4K iMac is 4096x2304, and not the standard 3840x2160.]
Apple also updated the 27-inch range. Instead of keeping the older QHD displays and having a separate 5K range, Apple instead replaced the older models with 5K range. There are now three 27-inch iMacs with 5K display. The base and middle models have a 3.2GHz (Turbo Boost up to 3.6GHz) quad-core Core i5 and the top of the line model has a 3.3GHz (Turbo Boost up to 3.9GHz) quad-core Core i5. All three models have 8GB 1867MHz LPDDR3 RAM. The base model has 1TB 7200-rpm drive, the middle model has 1TB Fusion Drive, and the top of the line model has 2TB Fusion Drive. They also have AMD Radeon R9 M380, M390, and M395 graphics, respectively, with 2GB GDDR5 memory each. They are priced at $1799, $1999, $2299, respectively.
Apple offers configuration options for almost all models, where you can upgrade the processor, RAM, storage or GPU while ordering. All models also come with the new Apple Magic Keyboard and Apple Magic Mouse 2 and a Lightning to USB cable to charge them.
Linux > Mac OS> Windows
This is not phone lad. Integrated graphics can handle high resolutions and have come a long way. Not an apple fan but really liking these to be honest. A branded pc from big brands cost 'about' the same.
Because they should used previous generation cpus, that aren't compatible with DDR4.