I bought a pair of Crucial 8GB DDR3 1866MHz SODIMM for my iMac 27 5K Retina Late 2015. I suspect the SODIMM that I received is 1600MHz, potentially counterfeit.
Here is my question
- Is there any way to read the SPD data for the speed, CL settings, and manufacturer ID?
How do I find the actual speed. Is the System Report -> Memory the actual speed or reading from SPD? I need both information.
How do I check if it's a genuine Crucial memory? (EDIT: I called Crucial. They said the material number 310536 isn't matching. They are investigating)
The Crucial part number is CT102464BF186D.C16FN.
The marking on Micron DRAM chip is D9QBJ.
FYI: Crucial web said CT102464BF186D is not compatible with Mac, but many people reported success and stable with their late 2015 iMac while small number of people reported random shutdown. It's my wild guess they hit the counterfeit DIMM that has the SPD programmed for 1866MHz when the DRAM chips are 1600MHz rating.