It's not in microcode, they're just disabling it in a microcode update. Microcode updates aren't replacements for microcode either, they're patches. The vast ma

It's not in microcode, they're just disabling it in a microcode update. Microcode updates aren't replacements for microcode either, they're patches. The vast majority of microcode is in ROM and can never be changed wholesale; updates can just patch in hooks and change certain things, limited by the number of patch slots available. Doing this does not "free up" any microcode. It's purely disabling a feature, there is absolutely nothing to be gained in return.