Why is my Quad core CPU showing 1400 MHZ when it should be 4.2 GHZ

Solution
That is a power saving feature. When you don't use the CPU it clocks down, consuming less power, producing less heat and also increasing the life span of itself and the motherboard power delivery. All modern CPUs have it.
That is a power saving feature. When you don't use the CPU it clocks down, consuming less power, producing less heat and also increasing the life span of itself and the motherboard power delivery. All modern CPUs have it.
 
Solution