One was a duff,did 2.8GHz on 1.30v but would not do 2.9GHz on 1.55.
Doesnt work quite right on my sli-dr Expert either.
Will not post from cold start giving the 4 led cpu not found code but works ok on a reset.
The other one is buzzing along cool as a cucumber 3GHz on 1.35v.
Smiffy