That's because the BIOS settings include the machine's boot sequence when starting up. If not, dual channel is lost.Starting your PC using USB rescue media is not difficult, although it first requires an adjustment in the BIOS (Basic Input Output System). If all 4 SODIMM are populated, make sure all ICs are coming from the same manufacturer.
Kingston usually have a locked BOM for ValueRAM Server RAM, but I can't find the same information for Mac RAM.
It's the only RAM brand which has a unique ICs manufacturer which is Micron. If you chose to upgrade to, for example, 2x32 GB, and have 2 memory slots free for future upgrade, chose Crucial RAM.A OWC memory kit with Hynix ICs won't work with an OWC memory kit with Micron ICs, even if they are "For Mac", with the same speed, timings, comes from the same manufacturer, and other specs. Do not mix RAM modules with different capacity/speed/manufacturer.Memory configuration with 2 or 4 memory modules coming from the same third party vendor is strongly recommended.įor troubleshooting RAM, please refer to this thread Memory upgrade troubleshooting in 2020 27-inch iMacs It might not be possible to mix your genuine Apple RAM with the modules listed above without impacting stability and performance. Please note that many people on this forum experienced problems when mixing genuine Apple RAM with third party RAM. See Installation instructions upon receiving your RAM module(s). 260-pin DR (Dual Ranked) or SR (Single Ranked).Shares same 1G圆4 or 2G圆4 organization spec as the original Apple RAM. * Not confirmed, but seems the only other model available on SK Hynix website. HMA851S6DJR6N-VK (original Apple RAM installed in 2020 iMac).Compatible SK Hynix part numbers (compatibility cannot be verified on manufacturer's website):
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