The AMD Radeon 740M and 680M are both integrated GPUs, but the 680M generally outperforms the 740M. The 740M, based on the RDNA 3 architecture, has a smaller core count (256 shaders) compared to the 680M (768 shaders) which uses the older RDNA 2 architecture. This difference in core count and architecture results in the 680M offering significantly better performance, especially in more demanding tasks like gaming.