The 4/24 bios is not the original. The earliest dated BIOS I've seen is 4/11, which I've been using with good success (1.6a @ 2.4ghz, 1.55vcore, corsair xms3200 @ 400mhz).
For those who might be interested, I've posted it for download here.
As for board revisions, the earlier ones, with...