Why is the SPD tab in CPU-Z empty in my laptop?

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Start with a Compact Flash slot for expanding sampling time and storing waveform data An External Trigger input lets drummers add an optional drum pad in So I have two Corsair 3000MHz RGB PRO RAM Installed on Slot 2 and Slot 4 and it shows correct 24GB running on 2933 MHz But why on CPU-Z

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