That means your CPU is throttling itself because of very high temperatures. It lowers its clock speed to reduce heat output, because apparently, your system doesn't cool very well. Does your case have good airflow? Did you place your cooler properly?
The cooling is ok, my CPu has a few options disabled from bios witch gives always a maximum power and speed so there is no changing the multiplier at any time. The CPU temps are ok, i documented myself about this, the only thing is "that temperature" and if it could have anything to do with that game problem.
Never noticed it before and i have it overclocked for a wile now.
So did this start happening recently? Would you be able to trace where this "SYS" temperature sensor is? It's might not be the CPU at all, because it has its own temp sensors. Maybe one of your chipset coolers are loose?
Well i think i found what it was. I moved my NB heat sink just a little wile the PC was on, bad mistake. Not the max was 37C at full load after a few ores of gaming.
Got a little scared there . Thanks for trying to help.