Well, if you are gaming at 1080p, then it should be able to handle it fine, but if you are going to be gaming on 1440p or such, then I would recommend upgrading your GPU's to SLI GTX 970's to play at Ultra at 1440p.
Also, if your GTX 670's only have 2GB of VRAM, then I would highly recommend upgrading to SLI GTX 970's as those cards come with 4GB of VRAM and games such as even the older BF3 use more than 2.3GB of VRAM with all settings set to Ultra and at 1080p. If you are going to be gaming on a higher resolution than 1080p, then it's a MUST to have 4GB of VRAM and the SLI GTX 970's would be a very worthwhile upgrade then.