Overclocking graphics cards&ASIC is a common practice among miners. Why? It makes the graphics card more efficient in mining a particular cryptocurrency and lowers the power consumption. Both of these things are desirable in cryptocurrency mining as they help to maximize profits.

Base memory overclocking is insufficient in most consumer graphics cards&ASIC to mine such cryptocurrencies at full performance, as the core is more useful in games than memory. So by performing graphics card&ASIC overclocking, we can often significantly increase the performance in cryptocurrency mining, up to 30% depending on the cryptocurrency, while lowering the power consumption.