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    AHCI causing lower SSD performance (Envy 17 SB)

    Discussion in 'HP' started by trucha, May 27, 2011.

  1. trucha

    trucha Notebook Consultant

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    Ok, this is weird. Before I enabled AHCI on my envy thru the registry, my ssd (vertex II) was getting about 90MB/s sequential write. Enable AHCI, and the write performance drops to about 30MB/s. Then I go back and disable it again, restart, and I'm back up to 80-90MB/s writes. I realize that running benchmarks over and over again actually results in lower performance because it doesn't have time to do garbage collection and whatnot, but these results are pretty surprising. I'll try em again in a week to see if there is any change.

    What gives? I'm not well versed on the intricacies of ahci, storage drivers, and all that. I guess my main question is - is this a problem with my laptop? Any suggestions on how to fix it?

    FWIW - I'm running the most up-to-date firmware on the SSD, and my bios is still at F.07 (not the newest one).
     
    trucha, May 27, 2011
    #1
  2. Bobmitch

    Bobmitch Notebook Virtuoso

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    Before recommending anything...I would definately update that bios to f.08 I don't know the exact fixes in the bios...but you have a SATA III controller. I have the x25 SSD that HP supplies and I am getting 230 mb/s read and half that write...with AHCI. Try the bios update and run again...
     
    Bobmitch, May 27, 2011
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  3. dlleno

    dlleno Notebook Deity

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    how are you guys measuring your r/w speeds?
     
    dlleno, May 27, 2011
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  4. Bobmitch

    Bobmitch Notebook Virtuoso

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    CrystalDiskMark seems to be the most up to date and understands SSD very well Give it a try
     
    Bobmitch, May 27, 2011
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