It seems, it runs 1.9-2.6GHz with both cores, but one core can go up to 2.9GHz using Turbo-Boost. No idea if we could take control of this...
Intel Core i5 4300U Notebook Processor
Intel Core i5-4300U Mobile processor - CL8064701477400
I understood there was a bug when rebooting a warm SP3 after updates - thermometer icon and shut down (happened to me once). I did not see the same issue in regular usage, only during restart and that should be fixed now.
I like dropbox mostly for keeping all document versions one month, counting only the last one as occupied space. Their algorithm is efficient, in a few seconds syncs large files (I wonder how, checking in blocks or something)... and if devices are in LAN (like mine) sync goes peer-to-peer full...
Some disassembling videos show four battery blocks in the left half, almost everything else is on the right: fan with liquid cooling pipes, controller chip, CPU/GPU in the middle, memory bellow and SSD at the bottom...
As I understood, Bluetooth is needed for the top button actions, powered by cell batteries. Other pen actions work using AAA (AAAA?) battery and do not need it.
I noticed that service is occupying CPU sometimes in the beginning... not lately, although I switched off auto-update, just to inform me when something is new and I decide when to download and install...
It happened to me twice, around 30% and 42%, before the last week update. I tried a few things (manual auto-update, removed batterybar, limit indexing... etc). Then it discharged normally... but still no idea what is the cause.