- May 4, 2018
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I just put usb 3.1 usb mobo on usb 3.0 case, but somehow I am getting little bit lower speed than 3.0 too! about 20mbps lower than copying stuff from hdd. Why?
low speed on usb 3.0 ports while connected to usb 3.1 mobo.. lower speed than actual usb 3.0
- Thread starter vivekfichadiya99
- Start date
Solution
- Oct 17, 2011
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A 20Mbps difference for a connection protocol rated at 5+Gbps is nothing to worry about. That's a 0.4% difference at best.
Even if you meant 20MiB/s (~160Mbps), compared to the 625+MiB/s that's still not a very big drop (3.2%).
Most likely, the drop is because of limitations on the transfer rate from the HDD. In fact, the difference between SATA III & USB 3.0 is actually ~25MiB/s (600MiB/s for SATA III, 625MiB/s or faster for USB 3.0). So it's almost certain to be due to the HDD's limitations.
Even if you meant 20MiB/s (~160Mbps), compared to the 625+MiB/s that's still not a very big drop (3.2%).
Most likely, the drop is because of limitations on the transfer rate from the HDD. In fact, the difference between SATA III & USB 3.0 is actually ~25MiB/s (600MiB/s for SATA III, 625MiB/s or faster for USB 3.0). So it's almost certain to be due to the HDD's limitations.
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