Overvolting or undervolting does not influence turbo boost performance.
Overvolting or undervolting does not influence turbo boost performance.
I'm using a Core i5-760 with Turbo Boost 1.0, and I'm curious about the effects of undervolting or overvolting on its performance.
Likely won't alter anything. It was recently sold a shuttle board with an i7 920. The buyer asked for stock, so I checked the stock speed. It was running undervolt and core at 2666 with a clock speed of 0.97GHz at 2.8GHz due to auto-multiplier. No difference was noticed between stock voltage (~1.2V) and undervolt clockspeed. Both achieved 2.8GHz with auto-multiplied, but for these older ASF CPUs, overclocking would make them very slow.
The CPU won't notice any changes when under or overvolting. Ryzen 3000 and newer, possibly the 9th generation, could gain some performance improvement through undervolting. I haven't tested Intel, so their boost system isn't clear to me. For a first-generation core i CPU, the situation is different—my i5 4440 would only adjust based on timers, staying capped at around 3.3GHz and dropping back to about 3.1GHz after the 28ns mark. It was fixed, with no flexibility to alter its settings.
These early i5/i7 models struggle with high speeds. For better performance, disable speedstep and use a constant frequency and voltage.