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2026-09-17 · Source：TechRadar
A two-sided memory configuration lets the RTX Pro 5500 pair 21,760 CUDA cores with 84GB of GDDR7 — and an unusual 416-bit bus that has observers puzzled.
Nvidia has drawn attention to an unorthodox memory architecture at the heart of its RTX Pro 5500 Blackwell, a professional GPU that pairs 84GB of GDDR7 with 21,760 CUDA cores. Rather than fitting the memory in a conventional layout, the design uses a so-called 'sandwich' technique: a two-sided memory configuration that lets the card carry a far larger GDDR7 complement than its board would otherwise seem able to hold.
The 'sandwich' label refers to memory devices being placed on both faces of the card rather than on a single side. That approach is what allows the RTX Pro 5500 to reach the 84GB figure, a number that stands out on a spec sheet. For workstation buyers, memory capacity is often the decisive specification, setting how large a model or dataset a local GPU can accommodate.
The more puzzling element is the memory bus: 416 bits, a width the source report itself calls weird. GPU buses generally adhere to familiar increments, and 416 bits does not follow the usual pattern, which raises the question of how the two-sided array is actually wired into the design. The report does not resolve that puzzle; it simply flags the figure as the strangest part of the spec sheet.
For Nvidia watchers, the headline is that the RTX Pro 5500's defining trait is not its 21,760 CUDA cores but how its memory has been engineered. The sandwich technique shows Nvidia leaning on board-level ingenuity to push GDDR7 capacity upward, and the unusual 416-bit bus is the visible fingerprint of that engineering. Buyers evaluating the card for capacity-hungry professional workloads should watch for follow-up detail on bandwidth and thermals, which the current coverage does not address.
Mots-clés: Nvidia · RTX Pro 5500 · Blackwell · GDDR7 · GPU Memory · Workstation GPU
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