1 5 Gbps vs 3 Gbpps

And what about a SATA I HDD on a SATA II Motherboard?
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More about gbps gbpps
  1. Different versions of SATA can be mixed - the connection runs at the speed of the lower rated component. Occasionally a particular brand of drive will have difficulty connecting to a particular motherboard chipset if the SATA protocol versions are different - in this case most drives have a jumper that forces them down to the next lower speed rating.
  2. I have had SATA I and SATA II drives mixed without using jumpers and without any problems. I even had them running together in a RAID array.
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