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HP Compaq Elite 8300 Convertible Minitower PC
Microsoft Windows 10 (64-bit)

I upgrade my HP 8300 (i7-3770 processor, HP 3396 motherboard) from Win7 to Win10.  external HDs on rear USB 3.0 port only run at 2.0 speed. (~25-30MB/s).  I'm guessing it's a driver issue.  Tried "Update Driver" from Win10 Device Mgr but it says the "best drivers... are already installed".  Suggestions for getting my USB speed back up to 3.0 on this machine?  

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