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HIPM and DIPM together will provide better power saving, it is recommended to use the HIPM+DIPM setting in your Power Plan whenever possible. The Intel® X25-M SSD series supports DIPM, but can also work with HIPM only.
Please keep in mind that the Storage controller must be in AHCI (SATA) mode, and that some systems and OS versions may not allow modifying these power Settings.
Additionally, you can use the System Tuner from Intel® SSD Toolbox to make sure relevant Windows® features are optimized, this includes DIPM.
Hi Jonathan - thank you: actually HIPM+DIPM appears to be there already in some power plans, so I'm selecting the same in all others then (AHCI is on already).
Thanks & Regards,