I tried to unlock cores in the BIOS, but in msconfig and cpu-z showed that there are 4 cores as well. Maybe I got defective? What should I do with this?
Search “CPU monitoring software”. Some software only sees your fx as 4 and not 8 cores.
I'm using an Asus motherboard as an example: You use Advanced Clock Calibration in the BIOS. Set it to auto. Active CPU Cores lets you turn cores on/off but set it to auto to use all cores.