I've had 2 n900's now (accident, insurance replacement). 1st N900, i had on an 850 OC all the time and it worked fine. 2nd N900, i OC'd it to 850 and it crashed all the time, so i dropped it down to 805 and it's worked fine ever since. (It actually works fine on 1000 OC aswel, just not 850, strange).