AMD RX 5700 XT: Shortage of these graphics causes assemblers to demand more RTX 2070
Lack of existence of AMD RX 5700 XT graphics cards would be causing assemblers to demand more NVIDIA RTX 2070 graphics
The TSMC 7nm lithography used by AMD is proving a real success. The success of the Ryzen 3000 and Navi 10 processors is causing problems for TSMC to achieve production level. The Taiwanese foundry is also producing the chips for the new iPhones, hence the problems. This in turn would be causing a significant shortage of stock of RX 5700 XT graphics.
The good performance of the RX 5700 XT graphics is generating a good volume of sales. These new graphics are also much cheaper than NVIDIA's and the company has also corrected the consumption and temperature problems. Ray Tracing is also not a relevant element at the moment due to the shortage of titles.

AMD RX 5700 XT Graphics Stock Issues
AMD has changed GCN, an architecture not very optimal for gaming, for RDNA, developed by and for gaming. Navi 10 is the first iteration of this architecture and you can already see the power of it. The first silicones are based on 7nm lithography, which improves energy efficiency and temperature.
Due to the lack of stock of the RX 5700 XT, manufacturers are betting on the RTX 2070. The price of AMD graphics is around € 430 for the cheapest custom model. While the NVIDIA RTX 2070 graphics by the different assemblers start at € 500. Both offer quite similar performance, therefore, AMD graphics is a better solution for the end user.
Apparently manufacturers are beginning to demand more RTX 2070 graphics. On the other hand, production of the RTX 2070 has already begun to stop due to the output of the RTX 2070 Super.
Source: TPU