A much heared complaint about AMDs FX series is that the tdp is too high.
Now though some AMDs chips do spread more heat than most Intels, that's not always true -and I will disregard the fact that Intel has a slightly different opinion about what tdp precisely is and that the difference in opinion is in favour of Intel's marketing department.

Even Intel -with their definition of tdp- admits that the hyperthreaded hexacore i7s do run hot too, some get a 130 Watt value from Intel themselves.
When you think that that's not fair -comparing a $1000 chip with it's $200 counterpart- I can turn it around for you:

AMD has a AM3+ octacore that has only a 65 Watt tdp (that's twice as efficient as the A10-5700 and A10-6700, AMDs most efficient consumer APUs)
The name: Opteron 3380 and it will fit into consumer AM3+ mobos. It's more energy efficient than a regular i7, only Intel's energy-efficient i7s do as good ('S' line of SandyBridge, IvyBridge and Haswell), or better ('T' line of IvyBridge and Haswell, 'ST' line of Haswell), but at the same penalty as the Opteron: a lowered clock.