- Joined
- Nov 14, 2010
- Messages
- 369
- Reaction score
- 1
- Points
- 18
- Location
- Orange County, NY
- Your Mac's Specs
- iMac-21.5"(2017):OS Catalina 10.15.2 IOS13.3 iPhone 8+ iPadpro v2
A friend just picked up a used mid 2011 iMac with 21" monitor. I happen to have a 27" mid 2011 model and so I am the go-to friend with questions. His iMac has 4 GB of memory (2 x 2 GB) and he wants to upgrade to 8 GB using a single SO-DIMM he has already. Not wanting to give him incorrect info, can he use a single SO-DIMM? I am thinking he has to use either 2 or 4 of the same size.