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LeeAiso

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Jul 14, 2014
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I'm running Windows 7 and just migrated my system to a 840 EVO ssd.
Now I need to enable AHCI. Besides the BIOS what do I need to change. and how
 
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toyftw


Hi - If you have an Intel chipset, this is from a stickt right here on the forum and worked for me:

From Shadow703793

Enabling AHCI in Windows 7 WITHOUT re-installing/repair installing


Chances are, most of you out there are not running AHCI as most boards have IDE mode by default. There are a few advantages with AHCI over native IDE mode, mainly for SSDs. This includes ability to use NCQ and Hot Plugging (HDDs). For SSDs, this will give you a bit more speed.


I have only tested this under Intel chipsets. I have NOT tested this with AMD/nVidia chipsets (and AFAIK, neither supports...
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bigpinkdragon286

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Oct 3, 2012
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If the drivers are not enabled in Windows, changing from IDE mode to AHCI mode for your SATA devices will likely result in a BSOD and an unbootable computer.

Before making the change to AHCI mode in your BIOS, head over to this Microsoft Knowledge Base article and run Microsoft Fix it 50470 to enable the AHCI mode driver and prevent the Stop error message from happening during the boot process using AHCI mode.
 
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toyftw

toyftw

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Jul 29, 2012
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Hi - If you have an Intel chipset, this is from a stickt right here on the forum and worked for me:

From Shadow703793

Enabling AHCI in Windows 7 WITHOUT re-installing/repair installing


Chances are, most of you out there are not running AHCI as most boards have IDE mode by default. There are a few advantages with AHCI over native IDE mode, mainly for SSDs. This includes ability to use NCQ and Hot Plugging (HDDs). For SSDs, this will give you a bit more speed.


I have only tested this under Intel chipsets. I have NOT tested this with AMD/nVidia chipsets (and AFAIK, neither supports AHCI).

1. Open up regedit. (Windows Key + R > "regedit" ).

2. Navigate to HKEY_LOCAL_MACHINE > SYSTEM > CurrentControlSet > Services > Msahci.

3. In the right pane, right-click "Start" (look under the Name column) and then click Modify.

4. In the Value data box, type "0" (this is a zero, not a "O" ), and then click OK.

5. Restart PC, go into BIOS and set it to "AHCI".

6. Windows should start and install the Microsoft AHCI drivers.

7. Reboot and then go online and download the latest chipset drivers for your chipset from the Intel website.

8. Install the drivers. Reboot once done.

9. Congrats! Now you have AHCI using the Intel drivers!
 
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