| I highly doubt those 50 or 60 watt examples are representative of the power use of those U-series CPUs in a 13" laptop. Perhaps it has been configured differently in a NUC. Anecdotally, my work laptop has a previous-generation Ryzen 7 5850U (8 cores, 16 logical) in a 14-inch ThinkPad chassis. I just tried a 16-thread xz compression on it a few times and eyeballed the average power use with powertop. The baseline power with no load (except for what little idle load there was from whatever I had open) of the entire system was around 5 W with display brightness at a minimum. The battery discharge rate rose to between 21.5 and 22.5 watts for the couple of minutes the compression took. This was on battery since I had no tools for monitoring power use at hand otherwise. (Turbostat reports detailed per-core and per-package wattage from the CPU at least on Intel but the distro I've got for work apparently doesn't have that packaged and I'm not going to be hunting for a source package for this.) However, the compression took pretty much exactly the same amount of time on AC, so I doubt having it on battery affected CPU clock rates significantly. A 13" laptop chassis would also have serious trouble getting rid of 50 or 60 watts of prolonged heat production from the CPU. Also, where did you get the 52 watts in a laptop figure? The only reference to 52 on that page w.r.t the 5800U that I can find is a results of 51.9 points per watt, whatever those points are, in some kind of a power efficiency test. The power consumption test above that reports 42.9 watts, measured with an external monitor, so probably including more than the CPU. I also can't immediately find a reference to what kind of a chassis the CPU was in, laptop or otherwise. > raises the impossible question of how Zen 3 suddenly got such a huge performance per clock advantage going from desktop to mobile What kind of a PPC increase did Zen 3 get going mobile? I've only read about PPC comparisons between Zen 2 and Zen 3. |