Deactivate a particular CPU core as requested.
Deactivate a particular CPU core as requested.
Hey there! I’m feeling really overwhelmed by this situation, so here’s my take: After testing with MemTest86, I found that the RAM issues I was seeing came from the memory lanes set up for Core 4 on my i7 8700K. While the operating system can still function, any program trying to run on that core will keep throwing memory errors. I searched everywhere for a way to disable just one specific CPU core, but nothing came up. Most advice I found just suggested changing the number of cores in the BIOS to something like x-1, which isn’t really a fix. My concern is that disabling cores would hurt performance, especially since my CPU is already multi-threaded and cutting it down further would be a big drop. I’ve heard others online suggest using tools like Processor Lasso to limit programs to certain cores, but that’s just a workaround and not a permanent solution. The OS itself can’t be restricted in this way, and I’m worried about the risk of BSODs if something crashes. It’s frustrating because I really want my computer to work smoothly without these headaches.
I think the issue might be elsewhere in your system. Trying different slots like 2 and 4 instead of 1 and 3 could help. Also, double-checking your search results might clarify what you're looking for.
I don’t have a solution for this. It might require a special BIOS setup since there’s often no reason to disable a particular core. Curious about how you discovered the issue with memory lanes on core 4? You thought the memory only linked to the CPU’s memory controller and then sent data to the cache. Have you experimented with adjusting voltages to see if stability improves, or perhaps tweak the cache and memory clock speeds?
Occasionally BIOS updates allow you to turn off specific cores, usually for testing purposes. These adjustments ensure only the best-performing cores run at those high speeds. Such features are rare on regular consumer boards and typically absent from standard motherboards. Unless your system is built for XOC—like Maximus IX Apex, Gene, or Z170(M) OC Formula models—the likelihood of finding a BIOS with per-core control is extremely low.
The tool allows limited customization per application, requiring manual setup for each one. You can configure it to launch automatically at boot, ensuring consistent settings across apps. I’ve tried this with Cinebench to see if disabling the hottest core on my i7 10750H would help. The core I assigned to Cinebench was idle, handling background tasks or possibly running Process Lasso. You’ll be asked to purchase the premium version when opening the app, but not during automatic startup. The free version provides all the necessary features.