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I was curious if a CPU's IPC was based on it's architecture or if its a per CPU thing.

Like would an I5 4690k clocked at 4 ghz be as fast as an I7 4790k clocked at the same, assuming the hyperthreading wasnt being taken advantage of?

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You could say the peak IPC is architecture based. In practice, other factors can start to influence performance like cache speed and size, and ram speeds.

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