2017 iMac important to used matched RAM pairs?

[mikepro]

I remember back in the day with dual channel DDR2, it was important to install 2 identical matched pairs in a bank for optimal performance. Is that still true with current day iMac? In other words, if I want to add 16 GB, better to get 2 matched 8GB than a single 16GB stick of RAM?

Thanks!

 

[CWallace]

Yes, because of memory-interleaving performance boosts.

 

[Fishrrman]

On paper, "matched pairs" of RAM will always look better.

In real life, you probably won't notice any difference at all.

I replaced one of the 2gb DIMMs in my 2012 Mini with an 8gb DIMM.
Looks and runs the same... to me.

If you feel like splurging, put 2 DIMMs in.
If not, add just one.
I'll betcha either way runs just fine.

 

[Luxtrau]

I did some benchmarks with mixed and matched pairs. The matched ones are always slightly faster. If you notice a difference in daily use - I don't know. But yes, if you want to use the full potential use matched pairs.