it seems that Apple is nicer to its customers than ever before and you will definitely be surprised how the company behaved towards a certain Reddit user. He ordered a 27″ iMac at a price of 1999 dollars just a short time before the company Apple introduced a cheaper iMac with Retina 5K display. Newly introduced Retina In addition, the iMac is sold for the same price that the customer would have paid for the model without Retina display, and this is what he took Apple into consideration. As a result, the user received an informative e-mail in which Apple states that “We don't know if you've heard, but we just introduced the new iMac s Retina 5K display. And because we haven't fulfilled your order yet, we've automatically changed your order to a new iMac s Retina 5K display.”
It looks like the company plans to be even more customer friendly in the future and if they order a device at the wrong time (or correct?), Apple it will automatically supply them with a newer and better model if it is sold at the same price. However, according to the tests, it seems that newer does not always mean better in everything. For example, benchmarks have shown that the new AMD Radeon R9 M290X chip found in the Retina introduced yesterday is in some respects less powerful than the GeForce GTX 780M found in the iMac originally ordered. The graphics chip from nVidia also supports CUDA technology, which is used in some applications from Adobe and serves to accelerate the graphics card. This is evident, for example, when working with videos and a large number of audio tracks in Logic Pro X. On the other hand, the difference between the two cards is not so great that customers should be dissatisfied.

*Source: 9to5mac
once they already did it with ipeds... a friend changed a three for a four...
With us, a person can return a product ordered from the Internet within 14 days without giving a reason. In the USA, it is not a problem to return the product even after a long time (although it is not 3 months like in the old days when Slovenian students were able to buy electronics and return them at the end of the holidays).
I think you are Apple he was aware that the given customer would immediately return the older model and order new ones.
The AMD graphics are there for a good reason: Final Cut. Pro X, which uses OpenCL. This affects rendering and exports. AMD is simply much faster on OpenCL. This can be confirmed by those who have built hackintosh for working with video. Nvidia, which is similar in price, exports video about 3 times slower than AMD. New Macbook Pro for this very reason it also has new AMD and Mac Pro uses a pair of AMD. Nvidia is more for games and amateur software such as Adobe Premiere. The iMac 5k is simply a work computer, not a gaming computer.