Glad to see the correct answer at the top here. The "fireball" section of the P4 did run at double the frequency as the rest of the processor. So internally tha

Glad to see the correct answer at the top here. The "fireball" section of the P4 did run at double the frequency as the rest of the processor. So internally that was considered the processor frequency. One of my first contributions to the Linux kernel was a bugfix to the bogomips routine. It stored the result in a 32-bit variable and our 8+ GHz chilled test machines would cause that to wrap. It was then determined that the processor would be marketed using the slow clock frequency. This was the right answer, but it didn't feel like it at the time. That article predates the marketing change. It might have made them realized they needed that change.