thanks chri$ch for your answer.

got retail 860 (L926B436).
expected little bit better than i920.
with ht=on over 4,2 is hard
with ht=off over 4,3 is hard
ram is ok till 2300 cl9 with 1,40v imc.
i think i got a bad chip and the story with good and bad goes on like with i7920.
this would all be ok if the 860 would be cheaper then 920.