memory - I'm upgrading my RAM, and have conflicting results from CPU-Z and CrucialScan; how many RAM slots do I have? Also, 4x4GB vs. 2x8GB? - Super User
1x16GB vs 2x8GB vs 4x4GB RAM in 2022 | Single Channel vs Dual Channel | 1080P, 1440p & 4K Tests : r/radeon
Timetec 16GB KIT(4x4GB) Compatible for Apple DDR3 1067MHz / 1066MHz PC3-8500 CL7 Dual Rank for iMac (Late 2009 21.5-inch / 27-inch) SODIMM Memory MAC RAM Upgrade for iMac 10,1 and iMac 11,1 at Amazon.com
What is better: 2x8GB or 4x4GB DDR4 memory? | Hardware Corner
CMS 16GB (4X4GB) DDR3 10600 1333MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® iMac Core I5 2.5 21.5-Inch (Mid-2011) - A28 at Amazon.com