My current RAM memory has 1867Mhz and I want to upgrade with 2133Mhz.
Can this cause any problems?
The RAM is compatible with my iMac, at least the manufacturer says so.
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If you mix 2133 with 1866 it will all run at 1866.
Replace all memory sticks with DDR3 2133MHz
Use quality components (Crucial, Kingston) or you may encounter freezing issues