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Equation 11 · Part 1 · An Optical Fabric Turns Off-Package Memory Into an Extension of the Die

Symbol L

LL
LL

What this part means

L is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

Its job in the formula

L is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

The passage around this formula

…Using the whole-package figure as PcuP_{\text{cu}} therefore overstates the copper baseline’s energy cost relative to memory bandwidth alone, which means it understates βcu\beta_{\text{cu}} and, mechanically, would inflate any L computed against it. Even the “easy” side of this ratio is a biased proxy, not a clean measurement — and the bias runs in the direction that would make the optical case look better than it may actually be, which is exactly the wrong direction to lean on for a piece arguing that headline…

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