I think one possible reason for that, ideally these things need different memory. If you use high-bandwidth high-latency GDDR memory, CPU cores will underperfo

I think one possible reason for that, ideally these things need different memory. If you use high-bandwidth high-latency GDDR memory, CPU cores will underperform due to high latency, like there: https://www.tomshardware.com/reviews/amd-4700s-desktop-kit-review-ps5-cpu https://www.tomshardware.com/reviews/amd-4700s-desktop-kit-r... If you use low-latency memory, GPU cores will underperform due to low bandwidth, see modern AMD APUs with many RDNA3 cores connected to DDR5 memory. On paper, Radeon 780M delivers up to 9 FP32 TFLOPS, the figure is close to desktop version of Radeon RX 6700 which is substantially faster in gaming.