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You might have noticed that in all “Core” (i3, i5, i7, i9) series of Intel. The Processor names end in “K”, “F”, “KF” or None.
K: Unlocked for overclock but with integrated graphics card
F: Without integrated graphics card not unlocked for overclock.
KF: Unlocked for overclock but without integrated graphics card.
None: With integrated graphics card but not unlocked for overclock.