Taking ant S17, core moving T20T and ant S9k as the representative, a blockchain calculates the current return period of the current high, medium and low power mining machines (as shown in the figure below). It can be seen that the return cycle of the low-power mining machine is shorter than that of the high-powered mining machine with a higher price. But there are also risks lurking in them. Low-powered mining machines have a short return period, but their ability to resist risks is poor. Once the price of the coins falls, they will shut down first. Although the high-computing mining machine has a long return period, it has high anti-risk ability. In the bear market last year, it still has revenue.