GeForce RTX 2080 SUPER vs Radeon RX 6900 XT benchmarks
According to the hardwareDB Benchmark, the Radeon RX 6900 XT GPU is faster than the GeForce RTX 2080 SUPER in gaming.
The Radeon RX 6900 XT has a slightly higher core clock speed. This is the frequency at which the graphics core is running at. While not necessarily an indicator of overall performance, this metric can be useful when comparing two GPUs based on the same architecture. In addition, the Radeon RX 6900 XT also has a slightly higher boost clock speed. This is a frequency that can be reached if the GPU is cooled sufficiently and has enough power.
As stated by the manufacturer, the Radeon RX 6900 XT has significantly more memory with 16 GiB of memory compared to 8 GiB. Lots of memory is good when playing at high resolutions or with many monitors.
In addition, the GeForce RTX 2080 SUPER has a slightly lower TDP at 250 W when compared to the Radeon RX 6900 XT at 300 W. This is not a measure of performance, but rather the amount of heat generated by the chip when running at its highest speed.
In conclusion, all specs and GPU benchmarks considered, will recommend the Radeon RX 6900 XT over the GeForce RTX 2080 SUPER.