They have lots of them (called "chicken bits"). Some of them have BIOS flags, some don't. It's very very expensive to fix a bug in a CPU, so it's easier to exp

They have lots of them (called "chicken bits"). Some of them have BIOS flags, some don't. It's very very expensive to fix a bug in a CPU, so it's easier to expose control flags or microcode so you can patch it out.