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Equation 7 · Part 1 · An Optical Fabric Turns Off-Package Memory Into an Extension of the Die

Symbol P_opt

PoptP_{\text{opt}}
PoptP_{\text{opt}}

What this part means

PoP_opt 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

PoP_opt 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

…optical connectivity figure and the appliance’s 32-terabyte pooled capacity are both disclosed, even if the realized random-access figure specifically (as opposed to the module’s headline peak) is not. PoptP_{\text{opt}} is not available at all. Not in the chiplet-marketplace technical summary, not in Celestial AI’s own Hot Chips 2025 presentation, not anywhere on the corporate site that now forwards to Marvell’s. No wattage figure, no picojoule-per-bit figure, no energy-per-bit number of any kind…

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A subscript is a label attached below a symbol. It often selects a time step, component, category, or member of a sequence.

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