this happens in which game mode ?
co-op, multiplayer or single player , how many maps does it happen on and which ones ?
please also send specifics on your GPU clock; does your CPU usage drop with your GPU usage ?
so far sounds like an update problem tho , i would reinstall the game completely , one possiblity is that everyones having this issue with simular or non simular equipment or something got corrupt durring the update process , i got this game and will see if i have an issue i have AMD equipment as well PII 965/HD 7950
(before you resintall it though ; when in origin right click BF3 and click repair)