6.0-RELEASE/AMD64 Ram Capacity?

[Douglas K. Rand]

Nathan> I seem to recall various threads relating to problems with
Nathan> machines running at or above 4GB ram... what if any issues
Nathan> still exist?

Kris> Some specific drivers do not work on such systems.  FreeBSD
Kris> itself has no problems.

Is there a means of telling (or even better, a list) which drivers
handle (or those that don't) more than 4 GB of RAM?