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Looks like I underestimated the performance gap between the bottom (2133MHz) and top (4000MHz) frequencies of RAM.  Looks like the diff between is closer to 10-20% depending on application!  Encoding video.  Big difference. In gaming.. FPS the gap isn't as huge.  But still larger than I thought.



SO-DIMM is currently capped at 3000MHz. Example here.    So, I think it's fair to say the Mobo Manufacturers that go SO-DIMM are leaving say... 5% gaming performance on the table?  More for other applications.