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Slower Crystal Disk scores in AHCI

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December 31, 2012 12:27:40 PM


I have just swapped a 7200 RPM HDD with a Hybrid SSD (Momentus XT 500).

My BIOS has 3 options for Sata mode: SATA, RAID, AHCI

It has been in SATA mode, and my crystal disk mark speeds (at idle) improved slightly when swapping in the new drive.


So then I changed the mode to AHCI and made the changes in Windows to also use AHCI. After 3 reboots and everything seems happy, I tested it again at idle.

Some of the new tests are significantly lower than they were in SATA mode for the same drive.
SSHD with SATA mode:
90/89
30/35
.362/588
.509/.585

SSHD with AHCI mode:
77/65
29/31
.359/.622
.685/.610

Is something wrong here?

I didn't install any drivers because on both the Seagate and Asus (P5N7A-VM mobo) websites, there were no downloads for drivers or software for AHCI.

Is there something I should do or just switch back to SATA mode?

Other info:
I have 2 SATA HDDs in the computer used for storage, the hybrid drive is my new Windows Drive.
I would like more performance in gaming, probably for load times.
Win 7 x64

Thanks for any help
a c 98 G Storage
December 31, 2012 12:45:26 PM

You set your SATA mode in your BIOS. There are 3 modes (IDE, AHCI, and RAID) on nearly all modern systems.

There are no Seagate drivers required. All you need are the chipset drivers you previously installed with Windows.

So, in your BIOS, what SATA mode are you using?
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a b G Storage
December 31, 2012 12:55:37 PM

If you're comparing a fresh install to an install that had been running for some time, the latter may have an advantage with a hybrid hard drive because it has had some more time to figure out what to cache.
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a c 98 G Storage
December 31, 2012 1:06:50 PM

Sakkura said:
If you're comparing a fresh install to an install that had been running for some time, the latter may have an advantage with a hybrid hard drive because it has had some more time to figure out what to cache.

+1. This is very true. BTW, your system should definitely be running in AHCI mode per my previous questions.
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December 31, 2012 5:58:07 PM

Yeah it's an old Windows installation cloned onto the new drive.

Call my BIOS crazy, but under SATA Mode the 3 options are exactly: SATA, RAID, AHCI. I assume the first is really IDE.

I did notice loading the game's map was faster (27 down to 20 seconds) in the AHCI mode... but then again that could be because it was cached after the first time I tried it in SATA.

I don't know if I should switch back to IDE mode because of those lower numbers...
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a c 98 G Storage
December 31, 2012 6:31:10 PM

Leave in AHCI mode. The hybrid drive will "learn" from your use patterns the files to cache and performance will improve with continued use.
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December 31, 2012 8:45:37 PM

But won't it do that in either modes?
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a c 98 G Storage
December 31, 2012 9:33:55 PM

Possibly, but AHCI is the optimal mode for this hardware.
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