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After reading contradictory answers, I decided to make some tests to determine what the correct way to add (2 x 8 GB) RAM to existing (2 x 4 GB) RAM. And this are the results I found. Tested on iMac (27-inch Mid 2011) Intel Core i7 - 3.4 Ghz with High Sierra: (1) With the following configuration from System Information / Memory (by BANK): *** BANK 0/DIMM0: 4 GB - DDR3 - 1333 Mhz BANK 1/DIMM0: 8 GB - DDR3 - 1333 Mhz BANK 0/DIMM1: 4 GB - DDR3 - 1333 Mhz BANK 1/DIMM1: 8 GB - DDR3 - 1333 Mhz Geekbench 4 shows and memory bandwitdh at 8.76 GB/sec for Single-Core and 8.61 GB/sec for Multi-Core (Full results at : https://browser.geekbench.com/v4/cpu/101...) (1) With the following configuration System Information / Memory (by DIMM): *** BANK 0/DIMM0: 4 GB - DDR3 - 1333 Mhz BANK 1/DIMM0: 4 GB - DDR3 - 1333 Mhz BANK 0/DIMM1: 8 GB - DDR3 - 1333 Mhz BANK 1/DIMM1: 8 GB - DDR3 - 1333 Mhz Geekbench 4 shows and memory bandwitdh at 15.4 GB/sec for Single-Core and 16.6 GB/sec for Multi-Core (Full results at :...