SanDisk Ultra II slow performance

how did you install the OS? fresh install or did you clone? Is the SSD aligned to 4K? I see your MB has 6 SATA 3 ports. Do you know if they are all on the same controller or does the MB have multiple SATA controllers? If it has more than one SATA controller try a port on a different SATA controller to see if the performance is better. 

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