1. #1

    I don't know anything about AHCI mode. Please explain/help?

    I have not even received my computer parts yet, they will be here Wednesday, but I am trying to do as much research as I can about the absolute fine-tuning I need to do to my PC for top notch performance. Apparently one of the many things I need to do is run my SSD in AHCI mode.

    Except that I have no idea what this is or what it even does. I am a sheep, a damn sheep. I've heard that you really need to set the SSD into this mode BEFORE installing Windows 7. Confirm?

    So uh.. what's everything I need to know about this particular aspect of computer building?

  2. #2
    The Patient obake1's Avatar
    Join Date
    Oct 2011
    Location
    San Francisco, CA
    Posts
    261
    Quote Originally Posted by Sean_actually View Post
    I have not even received my computer parts yet, they will be here Wednesday, but I am trying to do as much research as I can about the absolute fine-tuning I need to do to my PC for top notch performance. Apparently one of the many things I need to do is run my SSD in AHCI mode.

    Except that I have no idea what this is or what it even does. I am a sheep, a damn sheep. I've heard that you really need to set the SSD into this mode BEFORE installing Windows 7. Confirm?

    So uh.. what's everything I need to know about this particular aspect of computer building?
    You can read about it here:

    http://forum.crucial.com/t5/Solid-St...-vs/td-p/57078

    You will need to set it in the BIOS before installing the OS otherwise you will need to do some registry editing to enable it in win7.

  3. #3
    Bloodsail Admiral Biernot's Avatar
    Join Date
    Mar 2009
    Location
    Germany
    Posts
    1,219
    1)
    Yes, you need to set your SATA controller into AHCI mode before installing windows. While there is a way, you can alter this afterwards, it doesn't work 100% of the time and it would be stupid not to do it before.

    2)
    The AHCI protocol provides some features, which enhance the speed and lifetime of your SSD / HDD. The two most notable things are:

    a) NCQ (Native Command Queuing)
    This is mainly intended for HDDs. Basically it allows your HDD to sort the incoming instructions in a way that optimizes and minimizes the path of the read/write head.

    b) Trim
    This is the internal "defrag" of SSDs. It enhances speed and lifetime of the SSD, by distributing writing procedures evenly among all the cells. (one cell only lasts for a limited amount of writing procedures)

    Both these things only work in AHCI mode and only on Vista/7. (Not in XP!)

  4. #4
    Some of the Z77 motherboards come with AHCI enabled as default.
    Intel i5 2500K (4.5 GHz) | Asus Z77 Sabertooth | 8GB Corsair Vengeance LP 1600MHz | Gigabyte Windforcex3 HD 7950 | Crucial M4 128GB | Asus Xonar DGX | Samson SR 850 | Zalman ZM-Mic1 | Western Digital Caviar Blue 500GB | Noctua NH-U12P SE2 | Fractal Design Arc Midi | Corsair HX650

    Tanking with the Blessing of Kings - The TankSpot Guide to the Protection Paladin - Updated for Patch 5.4!

  5. #5
    The Patient obake1's Avatar
    Join Date
    Oct 2011
    Location
    San Francisco, CA
    Posts
    261
    Quote Originally Posted by Butler Log View Post
    Some of the Z77 motherboards come with AHCI enabled as default.
    Yeah, the ASUS P8Z77V-PRO I bought supposedly has AHCI on by default. Just waiting for my processor/case/psu to come in and I'll have my new build sometime next week

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •