I had no idea what that was so I got interested. I found this: http://s-space.snu.ac.kr/bitstream/10371/136802/1/000000145238.pdf … "periodic training is required to compensate for voltage and temperature variations" Then: https://mail.coreboot.org/pipermail/coreboot-gerrit/2016-October/051732.html … (Look LPDDR4 Periodic Retraining) and thishttps://electronics.stackexchange.com/questions/301677/whats-the-standard-procedure-of-ddr4-training …
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So all points out that training is needed in all memory, but periodic retraining is to adapt to varying voltage and temperatures, which makes sense on a phone (LPDDR) but not on a desktop. Thanks for expanding my knowledge.
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All XXDDR# need periodic calib/training. These are split to lets say 2 categories. These happening by controller & these happening manually. DDR4 and LPDDR4 (it's more severe for LPDDR4) need both methods to keep up with the tight timings. The prob is that it's a guarded secret..
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The "extended" recalib isn't defined by jedec & thus you see many diff behaviors or difficulties & hangs (on mobos). Every vendor keeps that a black box, in order to compete in the OC space. Lastly, lower freqs do not need the extended recalib.
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