memtest - an idea

is it viable to have a memtest like process running full-time (low
priority) or scheduled, on running FreeBSD system to discover bad memory
sooner than a later (without taking the system off-line)?

being on the receiving end of a bad memory module (FreeBSD did random
reboots, checked the memory with memtest and there it was), it would be
nice if the OS could spot this.

vlad