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Changing from SATA II to SATA III

Last response: in Systems
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August 25, 2011 3:39:56 AM

I have a mobo which has two SATA III ports. I have an SSD and a HDD which are both SATA III.

When I run Speccy it reports that I am using SATA II only.

What do I have to set to make the drives operate in SATA III mode?

I can't find anything in the BIOS which should set it at SATA III. (It is set to AHCL.)

There is no difference between SATA II cables and SATA III cables is there?

What test is used to report the read speed of the SSD?

:) 

More about : changing sata sata iii

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a b B Homebuilt system
August 25, 2011 3:50:37 AM

I'm not sure how to address your problem specifically, but I did quite a bit of research on the subject and the SATA people say that there is no difference in the cables used for SATA spec. They wanted the SATA II and III devices to be backwards compatible with existing cables so that's what they did. You will notice some companies out there selling SATA III cables but in fact there is no difference.
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August 25, 2011 4:44:33 AM

When i got my mobo it had sata 3gbs and sata 6gbs cables I dont know if there is any difference though
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a b B Homebuilt system
August 25, 2011 7:25:33 AM

If your Mobo has only 2 SATA III ports then you probably have 5 or six SATA II ports and 2 additional SATA III ports. That means that any drives plugged into the SATA II ports will operate at SATA II speed (3.0 Mbps) even if they are SATA III drives. The difference is not in the cables, it's in the physical hardware (Chipset) built onto the Mobo and the Drives. In order to get your SATA III drives to operate in SATA III mode they have to be plugged into a SATA III Port.

You can't change the state of the SATA ports to SATA II or SATA III in BIOS. Again, Physical hardware issue.

AHCI (not AHCL) refers to the command set used to interface with the drives. the choices are IDE, AHCI or RAID. You should use AHCI (or RAID if you are creating a RAID set).

Please provide system specs. so that we can give you more specific help on getting your SATA III drives operating in SATA III. It may not be advisable depending on how your SATA III controller is implemented. Besides, the actual difference in performance is probably not that noticable.

As far as what test to use to report the speed of the SSD, well I can't help you much there. The actual speed that you see is somewhat subjective any way because it depends on what your system is doing. Check out some of the articles on this page for more info. http://www.tomshardware.com/reviews/Storage,5/Internal-...
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August 25, 2011 2:26:13 PM

Just to be clear, I have the cables plugged into the SATA III ports (0 and 1).

My Build
Case: Coolmaster Storm Scout
M/B: Gigabyte Z68MA-D2H-B3
CPU: Intel i5-2500K
PSU: Coolmaster 600 W
Memory: Ripjaws 1600 16 GB
SSD: Crucial M4 128GB
HDD: Hitachi 1.5 TB

I loaded the chipset drivers off the mobo disc.

Thanks for the replies.
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August 27, 2011 10:58:37 PM

I found a program called HD Tune Pro and ran it. Here is a summary of what it reported:

C: Drive, Crucial M4 128 GB, Benchmark Tab

Avg - 484.9 MB/s

ACS-2-SATA III

UDMA Mode 5
UDMA mode 6

D: Drive, Hitachi 1.5 TB, Info Tab
ATA8-ACS - SATA III

I am going to assume that Speccy is reporting SATA II incorrectly.
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September 9, 2011 2:50:01 AM

Best answer selected by Jambe.
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a b B Homebuilt system
September 10, 2011 2:18:32 AM

Jambe said:
I found a program called HD Tune Pro and ran it. Here is a summary of what it reported:

C: Drive, Crucial M4 128 GB, Benchmark Tab

Avg - 484.9 MB/s

ACS-2-SATA III

UDMA Mode 5
UDMA mode 6

D: Drive, Hitachi 1.5 TB, Info Tab
ATA8-ACS - SATA III

I am going to assume that Speccy is reporting SATA II incorrectly.


OK, your m4 is running at the rated SATA III speeds. I don't know about speccy, but I would dismiss those readings. You're running at SATA III.
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