I had an AMD processor with a max speed of 3.8Ghz, and just a minute ago, its speed was at 3.91ghz. I know it's probably no big deal, but why is it doing this? All i had running was task manager and minecraft (title screen). Is this a bad thing?
Added (1). I have and AMD processor, not had one.
It's called a "boost clock". It's where the CPU detects you are running something that requires more power from the CPU, so the CPU does a small overclock on it's own. It's also why when your CPU is idle it will go below its normal clock rate in order to preserve not only energy, but to give the CPU a longer life span. Don't worry about it one bit, the CPU is just doing its job.
The processors are really not that stable at max clock speeds they might fluct uate to still within a safe zone, my older processor did the same thing the max was 2.4 ghz but with nothing really running go up to 2.8 ghz for a while then drop back below 2.3 ghz nothing to be concern unless the the pc is freezing up