Do you have the fan that came with the 3800x installed? Or did you install a different fan?
If its the stock fan that came with the process, it is a very weak fan. 80 C is completely expected. If you ran something like Cinebench, you'd get something around 85 C or so. If you ran Ryzen Master's stress test, you'd see it get to 95 C and throttle.
It can handle 80 C just fine. But constantly running a CPU hot can shorten its life span if it spends most of its time over 80 C. If this only happens when encoding or doing other CPU intensive tasks, and you have the stock fan, this is normal and not something to worry about. If you want to treat your CPU a bit better, get an aftermarket fan.
If you get an aftermarket fan like a Noctua, and also ever have to RMA your CPU to AMD, do not mention that you ever used anything but the stock fan that came with it.