hey zatro i have the same craphics card His HD 6870 but my BF3 works fine. In the BF3 beta i had the same problem, but then i just called the shop were i buyed the craphics card and they had sent me an new card. From then i hadn´t any blackscreens in BF3 in skyrim now i dont have any blackscreens i think the 4gb fix worked for me, but 1hour ago i had a crash to desktop . no warning.... hmmm i hope they will patch this game soon