When you check the performance of the Dell AMD Radeon RX560/RX570/RX580 graphics adapter, the speeds may not be up to what was expected during actual use.
The AMD Radeon RX560/RX570/RX580 graphics adapter design specification lists a performance range for the card. When vendors build cards to match this specification, there are a wide variety of options that are selected in the implementation, resulting in cards with the same Marketing name but different designs and performances that are still within the vendor's specifications.
Due to this, Dell’s implementation of the AMD Radeon RX560/RX570/RX580 graphics adapter may benchmark slower that some other card models that may land higher in the performance chart range. Dell implementation and performances are within the range specified by AMD for these cards models - the design, power consumption range, memory size range, and chip choice are all factors in the card performance.
The following AMD site shows the spec range for the OEM version of the card (English only): AMD Radeon Graphics Specifications