CPUID maximum: It's a workaround to support really old OS (Win95/98) that doesn't support HT. Don't need to worry about this. Intel Virtualization (vt-d). Enable it if you'll ever run virtual machines. Disabling it simply prevents certain CPU instructions from being used, thereby freeing up silicon and generating less heat.. When enabled, the processor will limit the maximum CPUID input value to 03h when queried, even if the processor supports a higher CPUID input value. When disabled, the processor will return the actual maximum CPUID input value of the processor when queried. It is recommended that you leave it at the default setting of Disabled. You should only.
What is Max CPU ID value limit? The maximum CPUID input value determines the values that the operating system can write to the CPUID's EAX register to obtain information about the processor. Intel processors from the Pentium Pro onwards have a maximum CPUID input value of only 02h or 03h. WHAT IS SET Max ext Cpuid 3?. The maximum CPUID input value determines the values that the operating system can write to the CPUID's EAX register to obtain information about the processor. However, if you attempt to use a new processor with an old operating system, that operating system may not be able to handle the extra CPUID information provided by the processor.