Nov 07, 2014 Enabling AHCI Mode After Win7/8 Installation Guide (Channel Upload #60) Here we have an in depth how to guide showing. This article shows you step-by-step how to activate the AHCI Mode in Windows 7 to may boost up the performance of a SSD. This don’t work every time, but for example by the OCZ Vertex 3 with a Sandforce Chipsatz we got a nearly 50% boost up in our tests after activating this mode in Windows 7! Try this instructions and check the performance after that with a Benchmarktool like the AS SSD to see if it worked. If not only turn it back to the IDE-Mode and every thing works fine again. If you change the SATA-Mode only in your BIOS, without preparing it in Windows may Windows will not found your hard-drive any more and even after setting it back windows could strike loading your drive. Step by step instruction in how to activate AHCI So before setting something up in your BIOS start with this instruction to make Windows ready for the changes. Step 1: Open the registry-editor. To start it click on the startbutton of Windows 7 (1). Write in the searching-field “regedit” (2). After that press the „Enter-button“ or click on “regedit” (3). Step 2: Jump to the key “HKEY_LOCAL_MACHINESystemCurrentControlSetServicesMsahci” Step 3: Search on the right sight the entry “Start”, double-click it (1) and set the value to “0″ (2). Apply your settings with “Ok” (3). Step 4: Close the registry-editor and apply your settings by starting-up windows new. Step 5: After that start your BIOS (often you have to press the Button F2 oder entf on your keyboard). Now you have to search after the SATA configuration and change the IDE-Mode in the AHCI-Mode. Step 6: After a new reboot the system will install the SATA-drivers and Windows 7 will install automatically a standart AHCI controller driver. Here you can see a comparison between the AS-SSD Benchmark in SATA-Mode IDE and AHCI. In this comparison you can see the performance boost, not only in the reading speed else in the writing speed. According to experts, the 4K 64Thread test in which the reade and write operations are raised to 64 threads (parallel running processes) got the most weight. With the OCZ Vertex 3 with the SandForce chipset the activation of the AHCI mode brings a 50% performance boost. Step 7: Now you can install the SATA-drivers from your mainboardmanufacturer, if there is one available. In some cases this specific driver can raise the performance a little bit more. For this you will have to find the correct SATA-controller driver. Surf to the website of the manufacturer of your mainboard and enter your mainboard type on the page (1) and search the SATA driver (2). Download it (3). Step 8: Click on the Windowsstartbutton (1), enter “Computer” (2) and open the “Computermanagement” (3). Step 9: Open the devicemanager (1), click on “IDE/ATAPI-Controller (2) and search the “StandardAHCI 1.0 Controller” (3). Step 10: Click with the right mouse button on “Standard AHCI 1.0 Controller.” and choose “actualize driver software” Step 11: Choose „Search on the computer after drivers“. Step 12: Choose under the point “search” (1) and choose the directory in which you saved the drivers. Windows will install the drivers. The drivers are installed. Step 13: Now reset the computer agaiin. After the system boots up again, you can do the AS SSD benchmark again, to see the difference with the correct drivers. The Score is in our test a little higher with the original driver, so you can see, that it is good to test the original drivers. They boost the system up a little more than the custom drivers. Share and Enjoy. I have a couple of clients that I want to enable AHCI and the OS is installed. Case 1 > Intel SE7230 set in IDE mode for CD ~ already has Intel SATA PCI (SRCS14L) RAID adapter > working fine w/ hot swap cage. Reason > I want to enable AHCI to allow hot swap of attached (backup) E-Sata drive. When USB drive attached computer will not boot unless drive is attached after OS starts. Case 2 > Intel S3210ah with 3-ware PCIE Raid Controller Reason > same as above I believe it is a known fault (the USB defaults to boot drive in BIOS and cannot be changed) so I would like solution of hot-swap external drive (Esata preferred) so I can remotely reboot if necessary (install updates, apps, etc) without turning off the external drive. I have enabled after the fact with Windows 7 with a reg entry and enable in bios > success. One is SBS 2003 and the other is Server 2003. If I enable AHCI only ~ I get BSOD (on the Se7230) ~ have not tried on the S3210. ** sorry I didn't mean to put it in the video card section **.
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