Interestingly this review shows Alderlake-U 9W having great battery life. Greater than 14.5 hours using 51WHr battery is fantastic.
While the reviewer criticizes it having low performance,
the MT performance rivals 15W Tigerlake despite only having 10W sustained. Also
unlike Amberlake and previous low TDP attempts, this chip does not suffer from noticeably lower single thread results. Single thread performance is only 10% behind top Tigerlake which is an excellent result. This is twice the MT performance of Y chips, and those chips had MT performance at a standstill since the Broadwell Core M.
The reviewer conclusion is as always with the modern press, mediocre at the best. I don't remember them complaining when Tigerlake had 2/3rd MT performance of Renoir. Why the change in attitude now?
This is Amberlake class efficiency and what I hoped to see with Lakefield. This device achieves better battery life per WHr than Lakefield! I wouldn't have minded getting this device at all. This is a great progress and I would even call it Hybrid Unleashed.
I wonder if the problems aren't fundamental but higher level such as system and firmware settings? Otherwise this difference should not be possible. While this laptop benefits having 15W PL2, it shouldn't matter this much. Perhaps the discrepancy lies in the greater than normal binning differences between the 9/15/-P chips?