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USB 3.0 and SSD speed in Windows 7

Hi all!

I was making some tests regarding the speed of my internal SSD and of USB 3.0 on my notebook (Asus N76VZ) with installed Windows 7 64 bit, using CrystalDiskMark.

 

My SSD is a Samsung 840 Pro 128 GB. Here are the results of the test (mine are on the right, compared with some found on the Internet)

 

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SamsungMZ-7PD128BW840ProSeries128GBSSD_zps9b668d43.jpg

 

There's quite a difference.

 

About the USB 3.0, I tested a SanDisk Extreme Pro 128 GB pen drive, and here are the results (mine are always on the right) :

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Clik here to view.
SanDiskSDCZ88-128G-G46ExtremePro128GBUSB30Flashdrive_zpsb6afa2af.jpg

Also.in this case, there's a considerable difference.

 

I then tried the same speed tests on the same devices in Windows 8 64 bit (which was pre-installed in my notebook).

 

Here are the results for the SSD:

 

Image may be NSFW.
Clik here to view.
Windows8-SamsungMZ-7PD128BW840ProSeries128GBSSD_zpsd2610501.png

 

 

and here are for the pen drive:

 

Image may be NSFW.
Clik here to view.
Windows8_zps424dffd4.jpg

 

I was absolutely abstonished. I searched high and low, but I couldn't find an answer to explain this big differences between the results in Windows 7 and Windows 8.

 

As regards the USB 3.0, I can only say the drivers in Windows 7 are Intel, while Windows 8 supports natively USB 3.0 and the drivers are Microsoft.

 

Don't you think I want to blame Intel for this - I'm just looking for an explanation.

 

Anyone can tell me if there are known limitations in Windows 7 about the USB 3.0 and the SATA speed or whatever?

 

Many thanks in advance!


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