I think the point is he's trying to avoid having to upgrade to another motherboard when he just bought one.
I hate to say it but I don't think the Phenom IIs are fit to handle the next generation of gaming. Their time has all but come and gone. While they were very solid CPUs for their time in the spotlight (they certainly shined more than their successors, the current AMD FX-series CPUs) they are almost 2 generations old. Intel is soon to roll out their Haswell CPUs and AMD will be rolling out the successors to the FX-series.
I just upgraded from my Phenom II 955BE about a month ago. It served its purpose exceptionally, paired with an HD 6950 it could handle BF3 at medium-high settings (no AA) at 60fps with no problem. But even overclocked to 4Ghz it had trouble with Far Cry 3, which is border-line next-gen in regards to how demanding it is.
Now, the Phenom II x4 965 probably isn't your ceiling. If your motherboard supports the Phenom II x4, I'm almost positive it also supports the Phenom II x6, a true six-core CPU. That CPU is still a beast, but the problem is that no current video game uses more than 4 cores/threads. So unless BF4 is designed to use 6 or more cores/threads (which I doubt), the x6 wont perform any differently than the x4.
My old motherboard was originally an AM3 only board but I bought a later revision that allowed AM3+ CPUs (the FX series). I'm going to list all my old components on eBay soon but maybe I can sell you my AM3+ motherboard? It would allow you to run the best available CPU that AMD currently offers, the FX-8350. The FX-series is honestly kinda lousy in comparison to Intel's newest CPUs but at least you'll have a CPU that can run 8 threads simultaneously (again, questionable whether that makes any difference in games) and you can find it for $200. Regardless of how the FX-series compares to Intel's CPUs, the FX-8350 is definitely a bit better than the Phenom II x4 965, even in a 4-thread game.