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Hi, You cannot, you'd use 1600 or 1866MHz depending on the specific model. Please refer to your manual or product page to confirm. If you have anything else we can help with, please reach out: support.corsair.com -Art
Sorry, there was a problem. Please try again later.These memory modules are much slower than those specified for your late 2015 iMac. This memory is DDR3 PC3-8500 1066MHz. If you were to search for your iMac's specs you would find that it uses DDR3 PC3-14900 1867MHz.
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