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Old 03-16-2013, 12:15 PM   #1
tomahawk 1705
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Smile Enabling AHCI in Win 7 after installation

Well I just applied another tweak which I found to speed up the overall performance of my PC. During my install of Windows 7 I could not get the Hard drive to boot or load the Win 7 install in AHCI mode so I just settled for running my system in Legacy "IDE" mode.

After some time I was still bothered by the fact that my new motherboard had the AHCI feature but I could not get it to work. So I researched several websites including the Microsoft web site where I finally found the fix for my dilemmna here's the link http://support.microsoft.com/kb/922976
(note the registry tweak calls for changing the setting to "0" but you also have to select the decimal option as well not hexadecimal.)

There is a registry fix for this problem but you have to change the registry MSahci setting first before you change the AHCI mode in your BIOS otherwise windows will not know to load the AHCI drivers which enable the more advanced disk control features of the SATA 3 specification mainly the NCQ feature and Trim for Windows 7 users that have SSD's.

Once this registry fix was completed my system realized a noticable performance boost really happy I figured this one out, now really enjoying the benifits of the SATA 3 technology which makes my PC run much quicker now.

Tomahawk out

Windows 7 64 bit
AMD FX 8350 8 core CPU @ 4.2 Ghz
Gigabyte 990XA-UD3 AM3+ Motherboard
(On board Cirrus Logic sound chip/W Dolby Digital)
16 gigs of Kingston Hyper X Ram@ 1366
750 Gb Seagate Momentus XT HDD/W 8gb hi speed internal nand flash
XFX AMD Radeon HD 6950 2 Gb vram
Corsair GS700W PSU

Last edited by tomahawk 1705; 03-17-2013 at 08:28 PM. Reason: added spec
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Old 03-30-2014, 08:45 AM   #2
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I want to enable AHCI mode in my PC because i use SSD hard . But i can not find the AHCI Mode in Bios.
this is my mainboard and...

MB Name:Gigabyte Technology Co., Ltd.EP41T-USB3
BIOS Version : EP41T-USB3 F4
CPU Name :Intel(R) Core(TM)2 Duo CPU E7500 @ 2.93GHz
Memory information :Total physical memory 4094 MB
OS information :Windows 7 Ultimate 64 Bit version
CD version information :4-Series 1.40 B0.0113.1
my Win7 64bit is installed in a SSD Hard
but it seems in is not in AHCI mode
can i use the same method described here for enabling AHCI mode? or there is a need i change something in Bios setup?

The problem is my bios (Integrated pripherals) doesn't have any item about AHCI''you can see the picture of my BIOS screen here:


Last edited by afshkh; 03-30-2014 at 01:36 PM.
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