These are powered by Ryzen 7 7840HS ES (Engineering Sample) APUs.
It should be pointed out Topton on AliExpress are selling with a batch of Engineering Sample AMD APUs.
Let's hear it for the 680m/780m and now 890m. They are really are an engineering marvel. I'm still amazed I can play at 1600x900 upscaled to XESS high quality on so many new games on my 680m at 60fps. It may be AMDs finest work.