Help with USB 3.0 Card

In brief... could someone please help me understand my bottleneck using USB 3.0 devices? I just bought a Sigg Inc USB 3.0 PCIe add in card with bay hub and when transferring files to a portable HD (also USB 3.0) I'm only getting an avg of 70mb/s data transfer rate. I've updated every driver I can think of and windows appear to recognize the portable HD as 3.0 however when I look through device manger most of my USB hubs are listed as either High Speed or Full Speed including the 3.0 hub. Would moving the add on card from the PCIe x1 slot to my available PCIe 2.0 x16 slot help. (would that drop my graphics card to x8)? I wasn't expecting the 5gb/s obviously but I thought I'd be close to 250 mb/s range...

Windows 7 64bit SP1
Phenom II X4 965 Black 3.4 GHz (NO OC)
16gb (4x4) Corsair XMS3 DDR3 1333
Single XFX - ATI Radeon HD 4670
1 500MB Barracuda 7200rpm 3GB/s HD
1 1TB Barracuda 7200rpm 3GB/s HD
Siig Inc USB 3.0 PCIe i/e w/ 4 port bay hub
WD Passport USB 3.0 portable HD 1TB
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  1. The hard drive will only go up to about 100-150MB/s

    Smaller files will severely hit the transfer rate due to overhead.

    You will only see the maximum speed on large single files.

    60MB/s is twice as fast as USB 2.0 can manage on Windows systems.
  2. 70mb/s sounds about right for an external drive as its probably 2.5" or 5400rpm or both.
  3. Thanks for the fast replies guys,
    From everything I've read I'm getting "what's expected" but I'm still confused. If my external drive is rated at a Serial Bus Transfer Rate of 5 Gb/s and the internal HD I use for files is SATA 3 gb/s, why the comparatively low transfer rate? The 790x chipset shouldn't be the problem? At this point I'm just on a quest for understanding. lol. When I was shopping for my portable drive I bought in to the whole 3.0 "ten times faster" and "super speed" thing... Don't get me wrong, I'll take the 70 mb/s over the 21 I was getting before, but I'll regularly be transferring my Lightroom Catalog between my pc and laptop and was expecting a little bit better then a 30 min transfers vs. 1 hour. Is there any way to actually attain something like 250 or 500 mb/s real world transfers?
    Sorry for the ignorance, I'm self taught as far as computers go but I'm having fun figuring it all out.
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