Cap Windows 11 RAM with msconfig for testing, plus caveats
Windows 11 can be limited to a fixed RAM amount using the legacy System Configuration tool (msconfig). The guide walks through opening msconfig, Boot > Advanced options, enabling Maximum memory, entering a value in megabytes (e.g., 4096, 8192, 16384, or 32768), and rebooting to reduce the OS memory pool. To restore full RAM, clear Maximum memory and reboot. Note that Task Manager may show less usable RAM due to reserved address space, that Secure Boot can block the option on some machines (temporarily disable it if needed), and that this setting is intended for testing or troubleshooting rather than everyday use since it can significantly impact performance.