The Xbox Series X has a GPU teraflop count of 12, while the PS5 has a GPU teraflop count of 10.28. Teraflops, or trillion floating-point operations per second, indicate the computational power of a processor, with higher counts generally meaning better performance.
Lower-level APIs on the PS5 allow game developers to have more direct control over the hardware, resulting in better utilization of the GPU and more efficient performance. This contributes to the PS5's ability to match or even exceed the outputs of the Xbox Series X in some scenarios, despite having less compute units and lower memory bandwidth on paper.
The Xbox Series X has a max memory bandwidth of 560GB/s, while the PS5 has a memory bandwidth of 448GB/s5.