Let me get this quite straight. The AMD FX Series CPUs are all frauds. Well, not complete frauds. AMD lied about the amount of cores in each one. For example, the FX 4100; AMD says that it has 4 cores. In fact, it only has 2. This is because AMD are counting the threads as cores and saying that they give the same performance as the 4 core CPU. In your case, with your FX 6100, it doesn't actually have 6 cores. More lile 3 cores and 6 threads. I hope that this makes you a bit less panicky.
They're called modules, I believe. Each pair of cores shares resources. But in AMD, all 6 "cores" have temperature sensors and they're all supposed to show up as separate cores.