Isn't it the most likely that they just run in the TDP limit and that they basically have the same efficiency - just on different base clocks, as already mentioned by
@nicalandia ?
Jasper Lake was also on an admittedly earlier version of 10nm version. So it would indeed be a bit disappointing but not entirely out of this world.
We know that 10ESF (or whatever they're calling it now) clocks
way better than the 10nm Ice Lake process that Tremont uses. We saw those gains from Ice Lake to Tiger Lake, much less Alder Lake. So why do we see a regression here? Additional power intrinsic to a bigger core would explain some iso-process regression, but the process improvement should more than compensate.
Let's do some math, shall we? At 15W, the i7-1065G7 has a base frequency of 1.3GHz. At the same TDP, the i7-1160G7 has a base frequency of 2.1GHz. These are practically the same architecture, just on a different process. So at the same power per core and same architecture, we should expect ~60% higher speeds from process alone. Yet we see 15%
lower. Or instead of 2.00GHz * 1.6 = 3.2GHz, we see 1 - 1.70/3.20 = ~50% less than expected.
If we approximate cubic power scaling with frequency, then half the frequency => 1/8th the power. Gracemont as an architecture obviously doesn't take 8x the power of Tremont, so even giving plenty of error to the approximation, it really makes no sense.
Or better yet, we have actual numbers!
Reviews across the internet show Alder Lake getting very competitive performance with very high power consumption.
chipsandcheese.com
At ~14W of power to the cores, Gracemont runs around 3.1GHz (note, almost exactly in line with the extrapolation above). So again, how are earth is it down to 1.7GHz? Uncore power doesn't explain such a gap.
God I wasted too much time on this...
I am not sure why it's so hard to grasp. Same TDP limit and about 25% IPC boost. Sounds about right.
At the frequencies listed, yes, but why are they so low? That's my question.
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