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Afaik it's no problem to use a SATA 1.5Gb/s controller with a SATA 3Gb/s harddisk (spindle, non-SSD) due to SATA backwards compatibility (ignoring Force150/OPT1 issues for now).
To my understanding the interface speed will be throttled to 1.5 Gbps in this case, but what I don't understand and want to know is: does this throttling affect the read/write performance of the harddisk?
Say, I have a SATA 3Gb/s harddisk which has a sustained data rate of about 65 MB/s.
This 65 MB/s is far away from the maximum transfer rate of even a SATA 1.5Gb/s (150 MB/s) controller.
Would using a SATA 3Gb/s controller yield a (significantly) better read/write performance with the given harddisk than a SATA 1.5Gb/s controller? And if so, why?
1The read/write is limited by the hardware itself. SATA is just the data bus. If a HDD can only write 65 MB/s then thats the data cap of the bus itself. increasing the size of the bus won't change that fact. – Ramhound – 2014-03-04T12:43:12.220