Terminal command for sata link speed?

OS10.6.7. MBP 5.3 with 256GB SSD.
Since the "negotiated link speed" for the SSD is 3 GB/s most of the time, it varies from 3 GB/s to 1.5 GB/s once in a while. Is there a terminal command to "force" the SSD to always connect with a "negotiated link speed" of 3GB/s??
<Edited by Host>

If you "force" it, then you aren't "negotiating". I suggest letting it work the way it wants. You already get faster speed with that than most of us regular people could imagine.

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Terminal command for sata link speed?

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