SATA link speed

Hi, this topic didn't appear to be up here yet, so I'm going to ask it. When did the white MacBook switch to the SATA 3.0 Gb/s standard? I recently updated my hard drive to one that has 3.0 capability, but the link speed in the System Profiler says 1.5 only.
Every bit of research I've done tells me that SATA hardware is forward- and backward-compatible, meaning the only thing standing between my new hard drive and its full capability is the MacBook's firmware.
I noticed a recent firmware release for MacBook Pros that "unlocks" the faster standard, and it also mentioned that the newer white MacBooks have it already set up no problem. So my question is: Which model is the earliest capable of SATA 3.0 Gb/s? Also, if my late-2007 MacBook is not compatible...why is that? What is actually responsible for this limitation, if not firmware?
Thanks.
P.S. Your login link malfunctioned in Safari ("404 - We can't find the page you're looking for"). I had to use Firefox to post this message...my Mac was disappointed. Better get your "geniuses" on that

Ah yes, I admit now to have forgotten to search the MacBook Pro discussion posts. That's the only place I now see a date mentioned.
And indeed, this afternoon Safari allowed me to log in, after a week or so of "malfunctioning."
Thanks for the answer, but I would still like to understand what part of the computer is responsible for the 1.5 Gb/s limitation, since serialata.org clearly states that its hardware is forward compatible.
You have an impressive collection of devices; can I have one? :P

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    Respect -

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