My performance was awful. It would run okay for about a minute, then just decay into hangs and stutters that would last for 8 seconds at a time in some cases, for no reason at all. These things helped me and got my game running for now, until they get on with patching this rushed PoS. I also have a Phenom 955, but there's no reason it would be an issue with running this
Install DirectX from BF4/_Installer/DirectX/Redist
Run the X86 version rather than the 64bit version (Though with 8Gb of RAM this really shouldn't matter for you, but you could give it a shot)
Use the settings editor (Found here: http://battlefield.realmware.co.uk/bf4-settings-editor/downloads ) to turn DX11 off
Also, lowering my texture quality to Medium helped the stuttering a bit
You shouldn't be doing any of these things just to get the game to work as intended. I was grabbing upwards of 80frames per second with the bells and whistles turned on but the stuttering was ridiculous, so I had to compromise. It's not our rigs' fault, it's Battlefield's. And they're more worried about getting more paid DLC out than patches