My 2600k at 5 ghz pulled under 130 watts at full load with the igp turner off.
Its rated at 95 tdp and from my own testing there tdp is very close to the actual wattage they pull.if anything there about 10-15 under there tdp from intel in rwal world testing
Even if you turn the IGP on , power comsumption will not rise
during phases where the CPU part is at full load as there s
a mechanism that reduce the IGP frequency and bandwith
to give more room to the computing part.
Hence, a fully loaded 4C/8T Sb will likely consume about 90W at least
at stock frequency even with the IGP disabled.
Transposing to a 6C/12T SB-E , this would increase power draw
to 135W , and likely a little more since the IMC has more memory
channels and surely more cache.
That said, a slightly lower frequency than the 2600K should
allow to be on the 130W TDP envelloppe.
All will ultimately depend of AMD s Bulldozer perfs , wich will
be used as reference to decide the SB-E TDP positionning.