Would be good to have explanations of what the different fans are

[stuaxo]

I'm not quite sure what stuff like f75303 is.

[stuaxo]

OT, but I noticed cpu@4c shows a temperature but also keeps showing "Error".

[Steve-Tech]

So the f75303 is a temperature chip on the motherboard, local_f75303 is the temperature of the chip itself, and cpu_f75303 & ddr_f75303 are external probes connected to that chip. The other cpu is the CPU's self reported temperature over TSI.

Edit: Also the @4d is because the f75303 is found at register 0x4d on the i2c bus.

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OT, but I noticed cpu@4c shows a temperature but also keeps showing "Error".

That sounds like this issue on the forums, and should be fixed by BIOS 3.07 and later.