[citation][nom]ojas[/nom]Not in absolute numbers, but efficiency wise. I'm assuming the 17W procs will now pack as much punch as the earlier 25W ones, hence the 25W parts were pulled.And remember, these are average TDP values. Maybe the maximum power draw is closer to the average TDP now? Or idle mode wattage will be lower?Plus you have to consider that this TDP value includes the IGP. So yeah, performance/watt has gone up, even if the TDP is the same.[/citation]
Yes, efficiency's defeinitely improved, but it's been more a marginal increase rather than a distinct step increase. As I'd mentioned, the highest end of each segment was basically bumped by 200 MHz; so that means that they were able to squeeze that extra speed without a TDP increase. It's not a huge increase, though; and of course, the old Sandy Bridge chips also had the HD 3000.
To put it into perspective, we'd have to look at the best Intel offered with each core at each TDP point: while TDPs are more of a "limit," the highest-end ones generally would be all comparable:
55W - SB: 4C 2.7/3.7 GHz CPU, 650/1.3 GHz MHz GPU, 8MB L3. IB: 4C 2.9/3.8 GHz CPU, 650 MHz/1.3 GHz GPU, 8MB L3.
45W - SB: 4C 2.4/3.6 GHz CPU, 650/1.3 GHz MHz GPU, 6MB L3. IB: 4C 2.7/3.7 GHz CPU, 650 MHz/1.25 GHz GPU, 6MB L3.
35W i7 - SB: 2C 2.8/3.5 GHz CPU, 650 MHz/1.3 GHz GPU, 4MB L3. IB: 2C 2.9/3.6 GHz CPU, 650 MHz/1.25 GHz GPU, 4MB L3.
35W i5 - SB: 2C 2.6/3.3 GHz CPU, 650 MHz/1.3 GHz GPU, 3MB L3. IB: 2C 2.8/3.5 GHz CPU, 650 MHz/1.2 GHz GPU, 3MB L3.
All other specs are essentially the same, barring the change between the HD 3000 and HD 4000, the PCI-e 3.0 support, and the improved SSD support. I noticed that the Turbo frequency for the GPU, though, is actually LOWER below the high-end i7s on Ivy Bridge. In the end, the IBs are more efficient than the SBs, but it's only a small evolutionary step, and perhaps less than expected from a full-on die shrink from 32nm to 22nm.