Well, after the release of 1.0.4496, I thought that I was set. The memory-based lockups went away entirely.
However, I am still seeing random hard locks of my system. At this point, however, they don't seem to be reliably associated with any software component.
At present, I'm planning on investigating an issue that may be peculiar to the A7N8X-Deluxe-2.0, namely a voltage regulator chip that runs very near 100 degrees Celsius (yes - the boiling point of water!) in default configs.
Other than cooling that chip, or chalking my problem up to 'well, uname -a *does* match against [test|pre]...', I'm not sure what else to do. Any suggestions for collaborative, cross-mobo problem solving are welcome.