I would imagine it's I2C, to be honest I've not looked yet, my box of goodies is waiting for me at home.
There is no SMBus on the Pi. Although SMBus is of course just a very specific implementation of I2C.
With no case, I am not convinced the Pi4 needs any extra cooling at all (in the UK at least).
Even better is to get aluminum case - it is both big heatsink and case. Especially with the 3B+ model the heat goes to the board itself so it is nicely transferred to the case (unlike with older 3B model where this is not so efficient). There are cheap ones for Pi3 on ebay (like this one) however they will need redesign for Pi4.
Indeed. With 3B+ I use as a desktop I moved to wired ethernet too as I have it near. Also I play streamed games over Steam Link occasionally and the wireless in Pi3 has some performance issues documented here - it works fine but slows down every few (5, 10?) minutes killing frame rate => game over.
Which is the case with 3B+ as understand it (unlike 3B) and possibly also Pi4 (sea also this and linked blogs). They explained it somewhere that the SOC is upside down in 3B+ and heat goes into board ground plane, metal connectors (USB, ethernet,..) and thus also the case. So the case may be much better than isolated heatsink on top of CPU.
If the increased heat loss due to convection from the greater surface area (fins) is more than the heat being generated, then it is enough and throttling will not occur.
They actually announced (on Facebook) today that they are doing just that, and are already accepting advance orders... at a reduced price of course!procount wrote: ↑Thu Jun 27, 2019 10:27 amMy favourite case is the Argon One on my 3B+ as this uses the whole case as a heatsink (with thermal conductivity to the CPU) and includes a fan that adjusts its speed according to the CPU temperature, so it minimises any power and noise. I hope they will make one for the 4B too.
Well spotted! I've ordered one so will let you know. The description says it's for a 4