quote myself from another thread reporting similar issues:
From my experience and investigation this issue is a result of the Nvidia Waveworks/Gameworks engine being incompatible with the Radeon 6800 series cards (probably any older/legacy AMD cards and drivers since the specs pages says Radeon 7870 or better). I have Dual Radeon 6850's and cannot log in to any server; the game crashes when attempting.
When the game crashes the event viewer shows the cause to be the Atlasgame.exe with the faulting module the listed as the gfsdk_waveworks.dll - this is part of the Gameworks engine which creates the ocean graphics and physics effects.
I have not yet found a solution to this issue, and believe the only true solution is for the Dev's to optimize the game to run on different hardware and older/legacy hardware and drivers (unsure if that would even be possible).
