Symbol B
B is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
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Why this formula appears here
Here BW is realized, measured random-access bandwidth in bytes per second — not a marketing peak, not a sequential-streaming figure, since random access is what most large-model inference and any pooled-memory workload actually demands — and P is the power, in watts, that a system actually draws to sustain that bandwidth, attributable specifically to the memory-and-fabric subsystem rather than the whole machine. An index above 1 means the optical, unified case delivers more usable bandwidth per unit of energy than wiring the same total capacity to the die’s edge the ordinary way — a real, measurable locality gain, not just a capacity or reach gain. An index at or below 1, once the fabric’s…
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Symbol W
W is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
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Equation 3 · AI Hardware & Semiconductors
An Optical Fabric Turns Off-Package Memory Into an Extension of the Die
This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text.
Here BW is realized, measured random-access bandwidth in bytes per second — not a marketing peak, not a sequential-streaming figure, since random access is what most large-model inference and any pooled-memory workload actually demands — and P is the power, in watts, that a system actually draws to sustain that bandwidth, attributable specifically to the memory-and-fabric subsystem rather than the whole machine. An index above 1 means the optical, unified case delivers more usable bandwidth per unit of energy than wiring the same total capacity to the die’s edge the ordinary way — a real, measurable locality gain, not just a capacity or reach gain. An index at or below 1, once the fabric’s…
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