While it has a lower CU count and operates at a reduced frequency compared to the desktop Radeon 7900 XTX, the 7900M maintains a competitive stance with a peak theoretical performance of 38.5 FP32 TFLOPS, marginally below the RTX 4090 Laptop GPU's 39.7 FP32 TFLOPS.

The benchmark results from Geekbench 6 have shown that the Radeon RX 7900M has an advantage in Vulkan-based tests, surpassing the RTX 4090 Laptop GPU by approximately 9%. In contrast, its performance in OpenCL tests falls behind by about 25%, suggesting Nvidia's GPUs may be better optimized for OpenCL workloads. The differences in performance also reflect the divergent API optimization strategies of the two GPU manufacturers.

Notably, the reported maximum frequency for the Radeon RX 7900M in Geekbench 6 is 1736 MHz, which is lower than AMD's advertised game frequency. This could indicate a variation in clock speeds due to thermal or power constraints in specific laptop models, such as the Dell Alienware M18 R1, which may underclock the GPU to suit its hardware ecosystem.

The Geekbench 6 compute benchmarks, while insightful, do not fully represent the in-game performance capabilities of the GPUs. As such, the real-world gaming benchmarks are highly anticipated to provide a more definitive comparison of the Radeon RX 7900M and the GeForce RTX 4090 Laptop GPU. These forthcoming evaluations will be essential for understanding the practical performance implications for end-users.