do I need to upgrade my Mac memory in pairs
I am looking to upgrade the RAM in my 2019 27inch iMac. I currently have 2 memory slots available. Do I need to install the new modules in pairs?
iMac Line (2012 and Later)
For optimal memory performance, DIMMs should be the same capacity, speed, and vendor. Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:
- PC4-21333
- Unbuffered
- Nonparity
- 260-pin
- 2666MHz DDR4 SDRAM
If you have mixed capacity DIMMs, see the install memory section for installation recommendations.