I too suffered from a wide range of instability issues when i first bought this board.
The first thing i did is update the BIOS to 0506 but it did not help.
Spend several days and many hours trying to sort this out to no avail.... i was ready to throw this board at a brick wall..
However, i came across a very inconspicuous thread in another forum whereby a member noticed that ECC was turned on by default.
Upon checking my settings, i discovered that it was also turned on in my board.
I turned it off and presto !! No more random BSOD's..
I have included a screenshot of the setting in question... Check yours, it's worth a shot !!