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Veteran
I would actually contest that. I think it's more that x86 has been (much) more heavily optimized for that kinds of loads. Either way, it's irrelevant -- what's relevant is that x86 + the software stack that will be available to it will be much faster at desktop type loads than ARM + the software stack it has will be.
The issue isn't that people overestimate BD ipc, it's that you vastly overestimate what ARM will get. As I said earlier, the next ARM will probably reach or exceed x86 ipc on pure scalar numbercrunching. It's just that that isn't a realistic load for a desktop/laptop pc. For tasks that the desktop user cares about, like spell-checking and grammar checking text while layouting it, what matters is rapidly traversing complex and large data structures. And ARM really really falls behind there. Even if they did awesome evolutionary improvements over their last generation, they are not going to get to half of BD ipc when running at 2.5GHz.
And I'm not an ARM hater. I actually like the arch quite a bit, and the future ARMv8 will probably be the cleanest and best mass-produced isa ever. It's just that I have programmed on a lot of arm systems, and I have programmed on a lot of x86 systems, and I think your expectations are really unreasonable.
You obviously have a great deal of experience working with both architectures and i respect that, perhaps the memory subsystems will work heavily in x86 favour..but i still standby that you could make at least a comparative A15 ultrabook to a BD one.
As i have stated, i don't expect A15 to get within 30% of BD, BUT that wont matter a jot for W8 METRO performance..in that form factor, what will matter is things like thermal budgets, power budgets, which could go towards increasing the graphics side..(ironically AMD spin v Intel) decreasing the battery size=weight...or just simply MORE batterylife full stop.
This isn't a comparison that could have been done with A9's (too weak) or IVYBRIDGE (too powerfull) but BD is low enough down the pecking order to take a stab at.and A15's will be in that ball park (ish).IMHO.
Ok lets look at the other side of the equation, power, how much do you think realistically will both use at full load...and another comparison at light load?