Yes, you can adjust all cores except one to lower their performance.
Yes, you can adjust all cores except one to lower their performance.
You're considering setting up a server for both NAS and Minecraft. It's true that Minecraft servers typically run on a single core, which can save energy. Using an older, used Intel processor might work, but ensure it meets your needs. Building a dedicated server could be a good idea if you plan to handle heavy loads or optimize performance.
The processor increases the frequency just for active cores, otherwise they continue running at lower speeds regardless.
I believe the Core lineup can work well. I'm using the 4th generation version which includes distinct turbo settings. My second gen handled it too before it failed. I think Core2Duo and Core2Quad would fit as well, though it's been a while since I used them. My BIOS allows adjusting multipliers for each turbo; I set everything to 40 for maximum overclocking. But if efficiency matters, focus on power management—C states it clearly. Since these will be enabled by default, your server should operate as efficiently as possible, depending on the workload. You probably won’t notice much gain from fine-tuning. You might consider undervolting; a tool like ThrottleStop can help adjust boost settings for better battery life. Disclaimer: I’m unsure if your CPU supports these changes, my laptop isn’t compatible, and my desktop seems to struggle with them.
It seems you're suggesting the CPU should follow its built-in default settings for turbo boost. This approach helps distribute heat more evenly across cores, which can prevent any single core from overheating and reduce the risk of thermal damage over time. Your experience with fluctuating temperatures—ranging from 40°C to 45°C and back—suggests uneven heat distribution or possible thermal issues.