You shouldn't need to shut down your computer just to have low power consumption when you're not doing much. I just built a home server PC using an AMD Ryzen CPU and the entire machine consumes 24W, measured at the wall, when the hard drives are spun down. That's including the CPU/MB, memory, 4 case fans (at a lower rpm), and 1 NVMe drive, plus the CPU fan, the power supply fan, and all the losses from the power supply itself (power supplies aren't that efficient at idle loads). That's all less power than people here are saying this stupid GPU card consumes at idle (30W). It should not more than double my power consumption just to plug in a GPU card and have it do nothing.