Does AHCI mode result in better performance v/s IDE mode even on a 5400rpm hdd? It made no real difference when I tried it with a 7200rpm drive many years ago but I'm wondering if it had any difference on a laptop. It was my understanding that it mainly supported hot plugging and native command queuing.
It was set to IDE mode fresh out of the box and I didn't change it ever because I didn't want to reinstall everything and it went on for years even after a windows 10 upgrade. I clean installed 1703 but before that I set it to AHCI mode in the bios so that I can install rapid storage drivers instead of seeing IDE stuff in device manager.
Now boot from hibernation is significantly quicker and task manager shows a much more accurate number in disk activity say 20-40MB instead of a few MB's.
It's still a nightmare coming from a SSD system but it is drastically better v/s the older setup. If it does make a difference I might do it on other machines too.
I changed my mechanical drive from SATA AHCI to IDE when I got my 2nd SSD and enabled RAID0 on ports 1-4, set ports 5-8 to IDE which the DVD drive and 2TB HDD are on, I have noticed no difference in transfer speeds to or from the mechanical drive