Is undervolting still worth it for performance and efficiency?
Modern systems have a lot to gain from undervolting.
If you're not undervolting your CPU and GPU, you're missing out. Years ago, overclocking was all the rage. Even a moderate overclock could represent big performance gains, but as time has gone on, and Intel, AMD, and Nvidia have pushed their silicon to its limits, overclocking has represented less and less potential performance. PC enthusiasts have corrected course and focused their attention on undervolting in turn.
