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DDR4

The current generation of PC memory, DDR4, was introduced way back in 2013.

 

DDR4 offered improvements on its predecessor in several ways. For starters, speeds are better: DDR3 memory ran between 800MHz and 2133MHz, but DDR4 runs at 2133MHz and above.

 

Capacities have improved, too, with the maximum amount per module now 512GB rather than 128GB. That’s a theoretical limit for most users because they just won’t need that much RAM, but it’s nice to see the march of progress.

 

DDR4 memory sticks consume less power than their DDR3 equivalents, but their latency is also a little higher. In theory, this means response times will be slower, but DDR4’s increased speeds eliminate that bottleneck.

 

The only Model that runs DDR4 Memory modules is iMac Mid 2017.

 

There are four (4) versions of iMac Mid 2017:

iMac 18,3 (Retina 5k, 27 inch, Mid 2017) i7

iMac 18,3 (Retina 5k, 27 inch, Mid 2017) i5

iMac 18,2 (Retina 4k, 21.5 inch, Mid 2017) i5-i7

iMac 18,1 (21.5-inch, Mid 2017) i5

 

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