Hi
Till 2 weeks ago I was using my PI with USB boot. temperature was around 60C
two weeks ago I installed external USB SSD and I boot my Pi from this ssd.
now the temperature is around 78c all the time
is it possible that the ssd I installed cause the high temperature ?
What can I do ?
Regards
David
I haven’t noticed it on mine, but they are all mounted vertically on a DIN rail. The USB controller is relatively close to the system-on-a-chip (I know, everything on a pi is close to one another) so it seems plausible to me that running a power drawing usb device could raise the temperature.
I’d suggest a heat sink or a case with cooling features if you have a Pi4.
I was originally running with a heat sink on my Pi4 with USB boot (well, the SD Card was booting the pi, but then getting the rest of the OS from a USB SSD), and I was typically in the 50s to low 60s with an ambient temp of 20-25C. The USB chip does add a fair bit of work to the system when you run a fast SSD through it.
If you’re worried you broke something, it doesn’t sound like you did, so all good 
I’ve since gotten a Argon One cooling case, which has a passive heat sink built in, but also an active fan that can kick in based on the CPU temperature.
Since I got that last year my Pi has been chilling around 40-45 degrees about 95% of the time, without even turning on the fan. Only time the fan does come on is when I compile large things in ESPHome 
They’ve just released a version of the same case with a M.2 SATA3 to USB3 board in the bottom section of the case, so that’s also a good way to consolidate parts together if your current USB SSD is a M.2 SATA Card in an enclosure.
I have one on the way, to tidy my desk up a little 