SATA hard drive question

What is the difference in performance between SATA 6 Gb/s and SATA 3 Gb/s inteface?

I'm looking at buying these drive for an entry level server to run a Postgress SQL database on.

The drives are Enterprise SATA from Western Digital
http://www.wdc.com/en/products/products.aspx?id=30
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GerhardpetAsked:
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Michael-BestCommented:
That is read spead purformance so if you need fast read speads the faster the better.
However write speeds may be of some consideration dependeing on your systems requirements.
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Michael-BestCommented:
"an entry level server "
Please understand that the faster hard drives run much hotter than standard hard drives and will probably need better than an entry level servers cooling system.
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DavidPresidentCommented:
absolutely NO difference in speed, with ANY mechanical HDD on the market today.  If you can't pump > approx 250 MB/sec reads or writes, then interface speed makes no difference.

Now some 6Gbit HDDs have better features than some 3Gbit drives, but I interpret your question as to whether you have any benefit running the same drive on 6 vs 3Gbit, and you are not using an expander with multiple drives sharing the same physical path.
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GerhardpetAuthor Commented:
I'm not sure what you mean by
and you are not using an expander with multiple drives sharing the same physical path.

If we move ahead it will be a RAID 10 with 4 of the above mentioned drives.
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