this post was submitted on 27 Nov 2023
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Eh its the CPU. It's well known by now the 7945HX is a desktop class chip. It doesn't have any mobile specific optimizations.
Am quite confident something like 7940HS combined with the same 7900M will have much better battery life.
Other RDNA3 based laptops that has 7040HS class CPU paired with them have class leading battery life.
Other rdna3 laptops top out at the small monolithic navi 33 die though.