Are SATA 3.0 Hard disk faster?

Is there a real benefit in buying Sata 3 hard disk than SATA 2.0? Most 7200rpm Hard disk can't even maximize the bandwidth of SATA 2. Sata 3 makes a lot of sense on SSD.Does it increases that cost of a Hard disk without adding more read/write speed?
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More about sata hard disk faster
  1. There are fast SATA II drives that keep up with the SATA III drives so no real benefit. As you said HHD are not even close to max the SATA II interface.
  2. it makes a difference with solid state disks though.
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