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HP Zbook 17 G2 - slow USB3

HP Recommended
HP Zbook 17 G2
Microsoft Windows 7 (64-bit)

Hi,
I am experiencing slow transfer speeds over USB3 port - both for HDD and SSD external drives.


Regarding write speeds, I get between 25-35MB/s, more often towards the lower figure.This applies not only to HDD drives but SSDs as well, e.g. T5 Samsung external SSD over my USB3 barely reaches 30-33MB/s. Read speeds are no better.

On the other hand, on HP ElitePro 650 (roughly the same age as Zbook) write speed is 120-130MB/s, same applies to read speed which is around 130MB/s (for external HDD).

Both computers have Samsung PRO SSDs, so I assume the bottle neck is really the USB3 port(s) on my Zbook. Systems are Win7, all drives formatted as NTFS.
I tried to:

1 - reinstall drivers - which brings me to a question: where I can download the REALLY CORRECT drivers for my notebook let's say based on my serial number? HP driver download site is a complete mess as it sports all sorts of drivers for all sorts of HW configurations. So far I always downloaded Zbook G2 driver pack and opted for manual driver installation and pointed to a folder with these drivers.

2 - reset BIOS

None of the above improved the poor USB3 speed which is effectively at USB2 speed.

Thanks in advance for any support or advice.

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