According to Wikipedia:

Taking the "overhead"in to account, the approximate rate for SATA Rev. 
1.0 (1.g Gbit SATA) is 150 MB/s.  Current drives can operate at approx. 
157 MB/s, which would exceed the SATA Rev. 1.0 speed.

Additionally, there are other types of peripherals that can attached to 
the SATA bus that would exceed the SATA Rev. 1.0 rates such as SSD 
(solid state drives) which can operate in excess of 300 MB/s.

Tony Mayer






On 10/23/10 4:20 PM, Peter Shkabara wrote:
> Let's do some math. A 1.5G bit/sec translates to 192M Bytes/sec. Since most
> hard drives I have seen tend to top out at about 60-70 MB/sec, even the 1.5G
> cable has much room to spare!
>
> Note that this is based on calculations. I don't have any measurement data
> to refer to.
>
> Peter Shkabara
> -------------------------
> [log in to unmask]
>
> -----Original Message-----
> Does anyone know if there will be a significant difference in performance
> between a an internal HD SATA cable that works at 3G bits/sec and one that
> works at 1.5 G bits/sec? Theoretically should be twice as fast but then
> there is HD and buss speed to consider.
>
> I bought three 1.5 G bit cables on-line because I was told they were the
> fastest on the market, then I found the 3 G bit ones. I'm thinking not worth
> the hassle to pay to send these  back and order the faster ones.
>
>           PCBUILD maintains hundreds of useful files for download
>                       visit our download web page at
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         PCBUILD maintains hundreds of useful files for download
                     visit our download web page at
                  http://freepctech.com/downloads.shtml