GPU, of course, will be trimmed.
There are more and more rumors and leaks about the Radeon RX 5600 and RX 5600 XT video cards. Most interestingly, the certification data indicates the existence of versions with 6 and 8 GB of memory for each of these models.
But in fact, it is not necessary that these cards will exist in such modifications.
A source that has already proven itself in this area has put forward an assumption about which model the RX 5600 XT will be. He believes that the adapter will receive a Navi 10 GPU, but not in the full configuration. More specifically, the author talks about 3/4 of the current top-end Navi graphics processor, that is, 1920 stream processors, 120 texture units, 48 ROP units and a 192-bit memory bus.
Using an existing GPU will allow AMD partners to quickly bring video cards to the market, as there is no need to re-design PCB designs.
As for the release dates, there is information that the cards will appear in the second half of January, and they can be announced at CES 2020. There is no information about the Radeon RX 5600. Given the situation with the Radeon RX 5500 and RX 5500 XT, it is not a fact that the RX 5600 will go retail at all. But if it does, it can be assumed that such an adapter will receive 1664 stream processors.