yes, i have try with F6 ! i was to F2 before ...
also have tried the NB with 0.1, and 0.2
same problems !!!
now just got a crash with 4GB as well!! just now!
i think a have a bad slot or something
making more combinations with sticks-slots atm!
but the bad thing is that i can boot normally, i can do many jobs like normally and then it may crash after 1, 2 ,5 , 12 , 20 hours :-/
else i could make some fast tests and see what is going on