So they added 2666MHz memory to the name when actually it's part number 2666. But for the price it's not worth it for dd4 memory. If you have Ryzen or any AMD motherboard, you can overclock the 2133 bus with Intel XMP. However, this is not the same for AMD. The official maximum is 2666MHz at which the Ryzen memory controller is guaranteed. Above this frequency, overclocking territory applies. for AMD motherboards. So these chips are clearly NOT 2666MHz. I also sent them back which I paid for and only received 1 credit as Amazon cannot clearly see the returned items.
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