Your estimation is based on your chip not in tests with
a sizeable statistical sampling.
Where would your chip be positioned in this list ?.
https://docs.google.com/spreadsheet/pub?key=0AvsxWM_f24kDdEQ4eGhrdzV2aU94QVBZV2R6LXdIY3c&output=html
I've seen what passes for "arm-chair engineering know-how" in enthusiast forums and a list of purported OC'ing stats from anonymous people with unknown educational background or working experience is no substitute either.
Please understand, I am perfectly OK with you walking around thinking a 5GHz piledriver chip running Prime95 will consume less than 200W. But also understand that I find such a notion to be patently absurd given the data I have collected with the chips in a controlled setting.
At stock, FX-8350 4GHz w/turbo disabled, running on an optimized undervoltage (1.268V, measured) cooled by an NH-D14 (max temp 30C) the power consumption at the wall is 276W for Prime95 LargeFFT.
Pushing that up to 4.8GHz, requiring 1.560V for stability (measured), resulted in 55C temperatures and power usage at the wall
climbed nearly 200W to 470W.
Now I don't care how much of that 276W consumption at 4GHz you attribute to the FX-8350 itself, be it 140W or 10W...but the 200W
increase in power consumption that comes when increasing clockspeed from 4GHz to 4.8GHz is pretty much coming from the CPU...unless you seriously think the mobo itself is dissipating +200W.
Now for some numbers, these are all for the same hardware on all systems (same PSU, same kill-a-watt, same ram, ssd, OS setup, vid-card, etc) excepting for the CPU and mobo. The mobo for the Intel is ASUS ROG MIVE-Z, the mobo for AMD is ASUS ROG CVFZ (equivalent class and capability premium mobos, expected to consume the same power as the other during a CPU-centric test like Prime95).
FX-8350 @ 4.0GHz = 276W (at wall)
FX-8350 @ 4.8GHz = 470W (at wall)
i7-2600K @ 4.8GHz = 251W (at wall)
i7-3770K @ 4.8GHz = 224W (at wall)
Factor in power losses however and wherever you like, but you aren't going to convince me piledriver is going to use less than 200W at 5GHz.