A8 6500 multiplier is always 17,can not be higher than 17.
A8 6500 的倍频一直是17，不能动态自动调整。
We can only guess at what the problem is because we do not have sufficient information about your PC.
Did you upgrade the mobo BIOS to one that supports the A8-6500 when installing the new processor? Did you clear CMOS after the BIOS update and before installing the new processor? Does the mobo maker state that the A8-6500 is supported by your model mobo?