Yes 1066 Mhz DDR3 runs slower than 1333 Mhz DDR3. In practice you should not notice a difference. If your Mac is using Intel then the computer should automatically adjust to the slower speed.


Jim Fogle - 2024 BiaB (1111) RB (5) Ultra+ PAK
DAWs: Cakewalk by BandLab (CbB) - Standalone: Zoom MRS-8
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