Would the fx 6100@4ghz bottleneck a 2-way 670 sli config(the 670's are 2gb). I want to be able to play games like crysis 3 at the max at 2560x1080. If the 6100 does bottleneck, would the 6300 bottleneck.
There would be some bottle neck, yes. But it would really speed up frame rate on the games that are SLI aware and have Nvidia's blessing. The FX-6300 wouldn't be as bad, but I don't think it would be totally BN free. Maybe move up to the FX-8350 and O/C it.