![]() ![]() SO-DIMMs that are a consumer-level memory and more subject to spec issues. I would further speculate this is because the DIMM modules used are server spec ECC type DIMMs, which are more consistent in Apple spec compliance, vs. I would suspect it is different hardware marketing leads that have independently chosen the two paths. I am not sure why Apple does this rounding on the speeds of SO-DIMM memory but does not do it on their DIMM utilizing systems like the Mac Pro 2013 or the Mac Pro 2019, where they list 1866MHz and 2666MHz speeds respectively. Memory that can work in a PC does not always provide optimal results in a Mac, but due to Apple’s requirements for Macs, memory that meets its specifications will always satisfy PC requirements. This ensures complete compatibility with Apple computers, as well as exceptional performance and compatibility with PC systems. ![]() While this is the case with the frequency speed, other programmable parameters do create differences, and OWC memory is explicitly certified to meet, if not exceed, the stringent specifications Apple expects. Some computer makers, such as Apple, round the full spec (1866.6MHz) to 1867MHz and thus these listings. ![]() So, is there a difference? Is one faster than the other? But when you start shopping around, you find some manufacturers are selling memory labeled 1867MHz, while others are marketing 1866MHz. You may look at your “About This Mac” info and see that your iMac uses 1867MHz DDR3 modules. Memory speeds can be confusing, especially when upgrading. ![]()
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