Hello, I've been doing a lot of things to find out why is my cpu clock going down lately. The speed is quite random, sometimes it goes up and down. After all my research I still found nothing, I've done a lot of thing such as setting the power plan, configuring the bios, and basically all of the possibilities that I found from the answers on most hardware forums. After all the mess, I was thinking this could be my PSU and it needs to be changed, cause when I look at the voltage within HWmonitor it went up and down sometimes. For example, today it will be stable and two days later or even the next day, it will go down. Anyway, I'm using old CPU which is athlon x4 860k 4 cores up to 3.7Ghz.