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December 6th, 2023 16:22

Pros/Cons: AHCI/NVMe vs. Raid on (Dell Pecision 7680)

Precision 7680

Precision 7680

Hi, I have received a new Dell Pecision 7680 with 2 SSD hard disks & am about to set it up for a client.

Only preinstall of Win 11 on the unit.

Gone into the BIOS to check the RAID config, AHCI/NVMe is selected, reading the through set up manuals, it says:

SATA/NVMe Operation SATA/NVMe Operation Set the operating mode of the integrated storage device controller. By default, the RAID On option is enabled.

What are the pros or cons of changing to RAID on now?

10 Elder


22.5K Posts

December 6th, 2023 16:48

There's no real advantage to changing the mode at this point, yes.  That said, it's unusual for Dell to ship a system in AHCI mode -- unless the system is running other than Windows.  Dell's default is usually RAID/IRST on.

10 Elder


22.5K Posts

December 6th, 2023 16:30

The con would be you will either need to manually alter Windows to allow a RAID boot (boot it into safe mode, allow Windows to install the RAID driver, and restart), or you'll need to manually re-install Windows anew.  If you change the mode without doing either, the system will be rendered unbootable.

The pro of the RAID mode is that the same system image can be used for multiple hardware configurations.

Since Intel is in the process or removing AHCI mode from new systems entirely (it's gone from some newer consumer-grade Inspiron/Vostro systems already and will be completely gone from new systems sooner rather than later), the question will soon be rendered academic.  

It will also mean that publishers of non-Windows OSes (mostly Linux) will have to step up the IRST driver support -- or the distributions won't run on new hardware.

December 6th, 2023 16:44

So am I better to leave the mode: AHCI/NVMe?

3 Posts

December 10th, 2023 20:53

someone claimed on reddit that Raid ON provide 4 PCIe lanes to NVMe M.2 drive where AHCI will provide 2 PCIe lanes , is this information true ?

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