I ended up buying the i7-1265u from one of the Topton stores in ali, adding 8gb ram, 128gb m2, the fan and a 2nd sata cable.
They took almost a week to send it, but then DHL was pretty fast.
It came with 1x8gb 3200mhz ram stick of a Chinese brand, and a 128gb Fanxiang S501 m2 drive, nothing impressive, but for the price I will use both in another computer.
They pre-installed a pfSense installation that wasn't working at all, randomly freezing during boot with errors, but sometimes booting only into a terminal menu.
Not sure if it was already commented, I can see that some motherboards are coming with internal PC speaker and some not, mine not.
I installed Windows 11 pro, skipped the step to enter a key, but it was automatically activated online at some point after the installation. Not a clue of why or how, I didn't use a Microsoft account, just local one. When I realized that it wasn't displaying any warnings, I checked, and it was already activated.
Also installed 2x32gb 3200mhz Kingston Fury cl20 pack , apparently dual rank with Hynix chips, so far so good running Windows 11 without issues during my tests, although I had to install some Intel drivers by my own to cover all unknown devices in Device Manager.
As everyone here, I installed the "extended" Bios, configured it, and noticed a big improvement, many thanks for sharing your discoveries.
And mine came with a different power supply, 12v 10A, Chinese brand but heavy, >500 grams: