AHCI mode for ssd

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marcello2010

Commendable
Feb 7, 2017
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Do I have to change anything in my register to get AHCI working ? Because I think it isn't working.
I Have an AS SSD benchmark score of 352.
I see in the register at stoahci - startOverride that value is still on 3
I read it should be 0.
Will the system reboot normally then ?

 
Solution
ko888
My registry entry HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\storahci\StartOverride\0 data value is also 3 and this is what I'm getting with a Samsung 840 PRO SSD so that registry entry is meaningless in regards to performance:

Crystal_Disk_Mark64_Samsung840_Pro.jpg
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ArtPog

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Sep 17, 2014
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Your Gigabyte MB is a fairly old board so I'm assuming the SATA controller mode had been set to IDE as the default. Anyway you'll have to check this with the BIOS setting - PCH SATA Control Mode. If it has been set to IDE, change it to SATA. (Don't forget to save the BIOS change.)

If that's the case access the appropriate registry setting again (you seem to know your way around the registry) and modify the "Value data" field from 3 to 0.

Exit the registry, reboot and see if that's the fix. (But I wouldn't count on any great speed increase in your system.)
 
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Solandri

Solandri

Illustrious
Jan 4, 2012
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Grab CrystalDiskMark and run it.

http://crystalmark.info/software/CrystalDiskMark/index-e.html

If the 4k Q32 speeds are significantly faster than the plain 4k speeds, then your AHCI is on and working. AHCI enables NCQ among other things, which allows the drive to handle multiple data requests simultaneously. For 4k read/writes, a SSD handles the request faster than the OS can send them, so queuing multiple requests (Q32 = queue depth of 32 simultaneous requests) results in significantly faster 4k speeds.
 
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marcello2010

Commendable
Feb 7, 2017
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1,510


connected to SATA3_0,
 
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M

marcello2010

Commendable
Feb 7, 2017
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PCH SATA Control Mode is set to AHCI
 
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marcello2010

Commendable
Feb 7, 2017
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4KQ32 read=60.7 write =94.16
4K =18.02 =87.63

isn't that very low for a SSD ?
see in the register at stoahci - startOverride that value is still on 3
I read it should be 0.
Will the system reboot normally then ?
ssd4.png
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M

marcello2010

Commendable
Feb 7, 2017
23
0
1,510
as a matter of fact I'm running this SSD in AHCI for two years now but now i see that the Crystalmark benche is terribly low . The only thing I think is not ok is in the register - startOverride that value is still on 3.
For the rest AHCI is ok in the bios and in the register Start - DWORD is 0 (ok)
So my question is , is the value on 3 the cause and can I change it to 0 ?
Or is the SSD maybe the bad thing ?
 
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ko888

ko888

Titan
Feb 18, 2009
16,708
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84,990
My registry entry HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\storahci\StartOverride\0 data value is also 3 and this is what I'm getting with a Samsung 840 PRO SSD so that registry entry is meaningless in regards to performance:

Crystal_Disk_Mark64_Samsung840_Pro.jpg
 
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