USB Speeds from memory card transfer to PC

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Can anyone clarify if I am correct in saying this memory card when copying images to a PC via USB 3 could only manage maximum theoretical copy speed of 60MB/SEC? For the record I get around 40MB second speeds on this card transferring from the card reader to an internal HDD, if I transfer to an SSD the speed is around Would the limitation of the write speed to a PC be the card speed itself, because I imagine that USB 3 card reader can read/write much faster than this? The card reader being used is this one >http://www.lexar.com/node/4577

Speeds from card reader to PC:

via USB 2 to HDD - approx 27mb/second then drops with longer writes.
via USB 3 to HDD OR SSD - approx 40mb/second