Sata 3 getting really low speed? Help?!

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Zyeox
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2011/01/05 20:15:14 (permalink)
I am having a problem getting any Sata 3 speeds at all unless I have something setup wrong. I installed the drivers, right cable, in the right spot. Mobo recognizes that it is a Sata 3 drive. But I cant get any speed over 50mb/s and it may start out at 100 but it drops really quick. To copy over a 7gb files it takes about 4 to 6 mins. Now mind you this is going to the exact same drive but I just made a partition out of the drive. Unless this is the speed your suppose to get then I am really disappointed. My system specs are below.
 
Intel Core I7 950 @3.07GHz
ATI Radeon HD 5870
Corsair XMS3 6GB
Windows 7
EVGA x58 FTW3
WD10 02FAEX 1TB <= Drive In Question with OKGEAR Sata 6GB/s cable connected
 
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    wdflyer
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    Re:Sata 3 getting really low speed? Help?! 2011/01/05 20:19:00 (permalink)
    What kind of speeds are you expecting?
     
     

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    doorules
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    Re:Sata 3 getting really low speed? Help?! 2011/01/06 00:25:17 (permalink)
    it may be a sata lll drive but it's still just a spinner drive

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    wdflyer
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    Re:Sata 3 getting really low speed? Help?! 2011/01/06 07:31:52 (permalink)
    Just wanted to make sure you understand my question and doors statement:
    Although it is a SATA III drive, the sustained drive transfer rates are not any better than that of a SATA II drive. 
     
    The drive's interface can handle SATA III speeds, but your drive's internal max sustained data transfer rate is 126MB/s.    
      
     
    post edited by wdflyer - 2011/01/06 07:35:56

    Gizmo: Asus MVF - i7-3770k - Corsair H100 - 32GB G.Skill 2133MHz - Radeon 7970
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    1TB WD Black - Seasonic 1000w Platinum - CM HAF 912
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    yv4ev3r
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    Re:Sata 3 getting really low speed? Help?! 2011/01/06 07:58:51 (permalink)
    I hv a corsai realssd 64gb, the spec show the reading speed is up to 355MB/s for SATAIII.
    I enable AHCI still getting only 270MB/
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    taniquetil
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    Re:Sata 3 getting really low speed? Help?! 2011/01/06 23:50:36 (permalink)
    A few things about SATA 3:
    1) If you're using a physical HDD, then the bottleneck is going to be at your hard drive spindle speed. Transferring files to and from 7200RPM drives can get up to 120-140 MB/s. It may help if you tell us the specs on the drive you are transferring files to and from. Or maybe you're unrar=ing a large file. Either way, just because an HDD is compatible with SATA 3 doesn't mean it'll be any faster because the bottleneck is not at the storage controller, but the storage medium itself.
     
    2) To the person asking about the Corsair SSD. 355 MB/s is only the theoretical maximum for the drive controller (I don't know what model drive you are using), but there are a few things ton consider. For one, the firmware on the SSD has some overhead, and the SATA 3 controller has some overhead. Plus you have to consider that sustained write and burst write are not the same. If it can reach 355 MB/s on burst, it's unlikely it'll be able to hold down a consistent 355.
    Finally, what are you doing with your SSDs that the difference between 270 and 355 Mb/s is really a factor?




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