Apple says the whole line of iMacs will get big graphics bumps. The 21.5-inch models will get an Intel Iris Plus chip for graphics that are 80 percent faster than the previous generation.
The 21.5-inch with 4K display gets a Radeon graphics processor that Apple says will boost graphics performance by up to 3X. The 27-inch iMac gets a Radeon Processor with 8GB of computing power.
The 21.5-inch model starts at $1,099, the 21.5-inch with 4K Retina display starts at $1,299, while the top of the line 27-inch starts at $1,799.MS