Just for the record, folks, as soon as the RunCore 64GB SSD arrived, I put it in the external USB case that comes with it (GREAT IMPROVEMENT, MDD!) and cloned the HDD in my Mini 10v (running 10.6.3) to it. Then, I did a test run with it as the startup (still external) on my Mini 9 (which was running 10.5.8). It seemed to work, so I swapped the RunCore into the Mini 9 (ran NBI 0.8.4RC1 on it, of course), and started up. It seemed perfect at first--too good to be true. And, it was too good to be true, because, though the speakers worked after another restart, the internal microphone was not recognized.
I then applied several "fixes" mentioned in the Forum, but things just got worse (no speakers, either). When I restarted from the 10.5.8 system from the external case, audio (mic and speakers) worked fine. So, I gave up and used the original STEC 16GB SSD, now in the external USB case, to re-clone the internal RunCore 64GB back to 10.5.8. And, that works fine in the Mini 9.
I note from the Forum that 10.6.3 exhibits audio problems. My apologies for not linking back to them, but I just learned about linking back. And, alas, I have since closed those tabs in my browser and cannot locate them easily.
Bottom line: I do not know whether the audio issues that I experienced in my Mini 9 with 10.6.3 are attributable to 10.6.3 oddities (as others have reported) or to some Mini 10v-specific objects that are not compatible with the Mini 9. Also, I wish to sing the praises of the new RunCore Pro IV PATA 50mm Mini PCIe SSD package that comes complete with the correct size screw driver (Philips 0) and an external USB case and cable. The RunCore Pro IV SSD has the same form factor of the initial STEC SSD, so it does not overlap the WLAN real estate inside the Mini 9, and the external case avoids the issues that others have reported about the USB port attached to the RunCore SSD breaking off (a USB port is still there, but no longer needed because of the superior solution with the external case).