New Silicon Insider Article

Article: Escape From the Planet of x86
By: Tvar' (unununium.delete@this.hotmail.com), June 18, 2003 2:41 pm
Room: Moderated Discussions
>Yeah, half does seem a little optimistic. However, we know the 1.3GHz part has
>half the L3 cache, and cache leakage power is 7% of the 130W by itself. Going from
>the chart, and using the "chip power scales linearly with clock and as the square of voltage" approximations...
>
>Take out ~5W for half the cache
>125W * 1.3/1.5 = 108W
>108W * 1.1^2/1.3^2 = 77W
>
>We aren't at 65W (half power), but it's not all that far away, assuming the 1.3GHz
>chip uses a 1.1V source and the 1.5GHz chip uses the 1.3V source. I'm not sure
>that's a safe assumption to make, but 77W isn't too horrendous for the amount of
>performance that a 1.3GHz Itanium2 is likely to deliver. The only way that you
>could get those last 12W back is if somehow going to 1.1V from 1.3V *significantly*
>reduced leakage in the chip, on the order of what, about two thirds?

But you already assumed an overoptimistic leakage reduction because you didn't take out core leakage in the above calculation, and you assumed I/O power scaled along with dynamic core power.

I understand that only *Dynamic power* is proportional to V^2*F. Leakage by definition gets no frequency reduction benefit, and I doubt that leakage reduces with the square of supply voltage. I/O power is on a separate vcc and frequency determined, and it won't scale either.

I see it like this:

Power of 6 MB, 1.3 V, 1.5 GHz Madison using percentages from pdf:
Cache leakage  9.1 W
Core leakage 18.2 W
I/O 6.5 W
Dynamic power 96.2 W
Total 130 W
3 MB, 1.1 V, 1.3 GHz

Cache leakage 4.55 W
Core leakage 18.2 W
I/O 6.5 W
Dynamic power 59.69 W
Total 88.94 W
I don't see how a 1.3 GHz, 1.1 V, 3 MB Madison will get close to 65 W.
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