DamnKetoso, maybe it's only a cpu bottlenecking problem.
I don't think so. The CPU is just slow.
Amd's philosophy since a while back (phenom 1) was that Multithreaded apps will become the norm. They threw out single threaded performance for Lots of cores and MT optimizations. Amd is still on that philosophy, Look at bulldozer.
Tf2 isn't a heavily threaded application. If it was we'd see more fps per core.
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OP, try using the TLB patch (only for amd)
On my past system with a PhenomII 940x4. I benched 20 frames higher on the x264 benchmark than without the patch.