USB3.0, meet laptop hard drive (Q's about speed)

I just bought myself a fancy new Ultrabook with all superspeed USB3.0 connections, but the built in hard drive unfortunately only came with a 320gb hybrid hard drive (Zenbook UX32A-DB31). I dug out the HDD from an HP laptop I had sitting and found myself with a 400gb 5400rpm Toshiba MK4058GSX, but it's only SATA3. I have a USB3.0 enclosure to put it in, so I know the only bottleneck now (if there is any) will be the hard drive itself. I know the 3.0Gbps that SATA3 technology claims is only theoretical so what should I be looking at as far as the limits of this little laptop hard drive. Or for a more general question, how well does USB3.0 play with 5400rpm hard drives? Any help or advice is much appreciated, thanks! BTW first post, so hello to everyone :bounce:
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More about usb3 meet laptop hard drive speed
  1. it will be slower (compared to 7200rpm). but then again even 7200 will not even max out sata2 speeds. only ssd's can do that
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