On Mon, Sep 2, 2019 at 4:28 AM Jean Delvare <jdelvare@xxxxxxx> wrote: > No, decode-dimms doesn't know about XMP. I'm not even sure if the data > is inside the SPD EEPROM or somewhere else. So decode-dimms will only > report the standard speeds your memory modules are capable of, not the > overclocked / non-standard speeds. I was just looking into this, and found that the Wikipedia SPD page talks about the XMP data here: https://en.wikipedia.org/wiki/Serial_presence_detect#Extreme_Memory_Profile_(XMP) The wiki article references [20] this URL: https://web.archive.org/web/20120306230940/http://www.softnology.biz/pdf/IntelXMP_Rev1.1.pdf I guess this information is specific to DDR3, because my DDR4 shows nothing around bytes 176+ (0xB0) *However* it looks like the data is just shifted down into 0x180 instead. The data here begins with the "Intel Extreme Memory Profile Identification String": 0C4A, same as the Rev 1.1 PDF describes. I haven't checked through the rest of the data to see how much it matches, but it seems like it may be feasible to report XMP info. >From what I've understand, XMP 2.0 was defined for DDR4, but I haven't had any luck finding a public spec sheet for that online. -Hans
