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I've never had memory training be forgotten with my AM4 nor LPDDR5-based laptops and NUCs. Is this a new thing with AM5 or something? Or just a certain brand of
by magicalhippo 7mo ago
I've never had memory training be forgotten with my AM4 nor LPDDR5-based laptops and NUCs. Is this a new thing with AM5 or something? Or just a certain brand of BIOSes?
- sspiff 7mo agoIt's a common issue on consumer boards with DDR5 and more than two DIMMs installed. Doesn’t affect soldered memory or lower speed memory (like DDR4). Many memory controllers fail to achieve good speeds and timings at all on 4 DDR5 DIMMs, and fall back to running DDR5 at 3600MHz instead.
- justinclift 7mo agoWonder if DDR5 ECC ram has the same problem? I'm meaning the real ECC stuff, not the "on chip only ECC" that all DDR5 has.
- sspiff 7mo agoThe controllers which support ECC are usually a lot better and able to handle more channels. They also typically require active cooling.
- justinclift 7mo agoInteresting. Didn't know about the active cooling requirement. That being said, it's not hard to get a hold of a reasonably modern DDR5 EPYC board. Something like this: https://www.phoronix.com/review/gigabyte-mz33-ar1 https://www.phoronix.com/review/gigabyte-mz33-ar1 Expensive though.
- magicalhippo 7mo agoOk, so user selects too-high speed, controller tries for ages and fails, but doesn't save since it's overridden by user in BIOS? I distinctly recall thinking my LPDDR5 NUCs were broken since they seemingly didn't boot the first time, until I recalled the training stuff. Took up to 15 minute on one of them. But neither has had any issues since, hence my question.