IPC has nothing to do with clockspeed. Plus Bristol Ridge is being released for desktop with Excavator cores. Plus the 40% IPC statement is from an AMD slide. There is a good cumulative 25% to 35% IPC increase from Bulldozer to Excavator,so it probably isn't far off K10.
Lol, seriously you are telling me like I have not the foggiest. Carrizo on it's current low performance process is tuned for mobile, Ipc and clockspeed and headroom are very relevant if you wish to port this design onto desktop 65-95w (Bristol ridge). Also if benchmarks are going to be made upon performance of a throttling Excavator Apu, then that affects the comparsion being made to their ipc gains.
They cannot simply use the gf28lp for desktop, if they port it to 14nm then awesome, but I imagine they'll use the 28shp which to be honest is pointless.
The Stilt (a well know guru) proved that Carrizo loses it scaling and efficiency at higher frequencies.
'' Like I said before, these numbers are not perfectly accurate. Still, based on the numbers it seems that Carrizo cannot maintain it´s power efficiency at higher frequencies. Most likely the reason lies in the differences between the manufacturing process versions used for these designs. At low frequencies Carrizo is definitely more power efficient than Steamroller designs, however at ~2600MHz the two designs are already even. At frequencies higher than that Steamroller designs are more power efficient rolleyes.gif''
There is no magic in Carrizo: The design itself isn´t more power efficient at hardware level than the previous generations were. Carrizo simply has much more advanced, effective and most importantly finally functional power management. In fact at hardware level Carrizo is less power efficient than the previous generations due the changes in the design and the manufacturing process. At higher frequencies (>3200MHz) Kaveri / Godavari can easily outperform Carrizo in power efficiency.
http://www.overclock.net/t/1560230/jagatreview-hands-on-amd-fx-8800p-carrizo/520