Equation 2 · Part 1 · From Origins to Frontier: A History of AI Memory Systems and the Bandwidth Wall
Symbol t
What this part means
t 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
t is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
Full expression→Symbol t→Article meaning
The passage around this formula
with t measured in years. At t = 20 that factor works out to (3.0/1.6)^{10} 540 : a roughly five-hundredfold widening of the gap in raw compounding terms, and that is before accounting for the interconnect term separately. No single memory technology closes a gap shaped like that on its own. Every technology discussed below narrows it at one particular tier, for one particular class of workload, for a while — which is exactly why the industry kept needing a new one.
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A variable is a named place for a value. Its letter is a local label: x can mean position in one formula and a data point in another.
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Sources cited in the article section
- [5] JESD79: Double Data Rate (DDR) SDRAM Specification ↗
- [6] JESD212: Graphics Double Data Rate (GDDR5) SGRAM Standard ↗
- [7] Dissecting GPU Memory Hierarchy through Microbenchmarking ↗
- [13] AI and Memory Wall ↗
These citations provide research context; check each source for the exact claim it supports.