This seems to contradict several other reviews I’ve seen, which show the 7840u beating Intel in all efficiency metrics.
Three sources where efficiency and better battery life are reported for AMD across the board: Notebookcheck, Just Josh (most comprehensive comparisons IMO), and techradar.
Kind of interesting.
EDIT: It appears Ars made a mistake in their review, which explains why other reviewers had different results: https://old.reddit.com/r/framework/comments/16ytxjd/saved_you_a_click_16x_better_battery_life_if_you/k3ar79v/?context=3
This is the best summary I could come up with:
My third review of this laptop is probably the one that I (and many Framework-curious PC buyers) have been the most interested to test, as the company has finally added an AMD Ryzen option to the repair-friendly portable.
I won’t spend a lot of time talking about the design of the Framework Laptop 13 again, except to say that it remains a competent ultraportable, and there’s nothing that feels dated or clunky about its design now that didn’t already feel a little dated and clunky two years ago (the relatively thick display bezel is the main culprit here).
Another laptop in this category we generally like, Lenovo’s ThinkPad X1 Carbon, has been using the same basic design for years, so it’s not like Framework is in danger of falling behind in a chaotic and fast-paced industry.
All the Intel Framework Laptops have supported the same specifications for all four ports (USB 4 for the 11th-gen, Thunderbolt 4 for the newer ones), allowing you to install the expansion card modules wherever you want them without worrying about the particulars.
Framework also says the rear ports enter a “high-power mode” when USB-A modules are connected to them, which can reduce battery life.
But some modules are better fits for some specific ports, and you’ll have to be a bit more careful about where you put things if you want the best performance and battery life.
The original article contains 532 words, the summary contains 233 words. Saved 56%. I’m a bot and I’m open source!
Not bad at all. It should be able to get more battery life if you put it power saving mode, where the max perf is restricted.
