Does DDR4 in general require periodic retraining, or is that just an LPDDR4 requirement? I can't seem to find much reference to DDR4 periodic retraining, but it's hard to prove a negative through the lack of search results :-)
Varying temperature should definitely apply on a desktop though, and even more on a laptop.
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Everything points to training being done only on boot for DDR4. See http://www.oldfriend.url.tw/article/SI/TN_4040_DDR4_Point_to_Point_Design_Guide.pdf … https://www.jedec.org/sites/default/files/JS_Choi_DDR4_miniWorkshop.pdf … (slide 10) and http://www.xilinx.com/Attachment/Xilinx_Answer_60305_rev_2014_4.pdf …
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Thanks for the pointers. I wonder what makes LPDDR4 so different in that regards then. Voltage changes would be my best guess.
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