cDIMM Z-Axis Compression Connectors for Memory Scalability
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Solution Overview
Problem
Existing information handling systems using Small Outline Dual In-Line Memory Modules (SODIMMs) face challenges with high memory channel loading, leading to lower speeds and increased power consumption, due to the need for more connectors and complex signal trace routing, which results in congested PCBs and higher layer counts.
Innovation Solution
The use of Compression Dual In-Line Memory Modules (cDIMMs) with z-axis compression connectors that provide a stand-off from the PCB, allowing for separate metal contact elements for each signal and power line, and reversible configurations to minimize signal trace crossings, enabling more efficient memory channel routing and higher data transfer rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If SODIMMs are used to increase memory capacity, then memory capacity is improved, but PCB real estate consumption increases and signal trace routing becomes complex
Solution Approach 1:
The patent transitions from planar memory module placement (x-y plane) to vertical stacking in the z-dimension. cDIMMs are stacked vertically using z-axis compression connectors, allowing multiple memory modules to occupy the same PCB footprint area. This dimensional change enables increased memory capacity without proportionally increasing PCB real estate consumption.
Solution Approach 2:
The patent implements a nested structure where multiple cDIMM modules are stacked vertically one on top of another, with each module nested within the vertical space occupied by the previous module. The z-axis compression connectors enable this nesting by providing mechanical and electrical coupling between stacked modules, allowing memory capacity to increase while maintaining a compact PCB footprint.
2Quantity of substance
If more connectors are used to increase memory capacity, then memory capacity is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple connector functions into a single z-axis compression connector interface. This single connector type handles both mechanical attachment and electrical signaling between stacked cDIMM modules and the PCB, eliminating the need for separate connectors for each memory module. The compression connector integrates power, data, and control signals into a unified interface, reducing overall device complexity while supporting increased memory capacity through vertical stacking.
3Adaptability or versatility
If z-axis compression connectors with different depths are used, then scalability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by providing different connector depths at different locations in the stack. The first z-axis compression connector has a first depth while the second has a second depth different from the first, allowing each connector position to be optimized for its specific stacking requirements. This localized differentiation enables scalable configurations while maintaining manufacturing feasibility through standardized connector designs adapted to specific positions.
Data Source
AI summary
An information handling system includes a first z-axis compression connector, a first dual in-line memory module (DIMM), a second z-axis compression connector, a second DIMM, and a printed circuit board. A first side of the first compression connector is affixed to the printed circuit board. A first surface of a first memory circuit board of the first DIMM is affixed to a second side of the compression connector. A first side of the second compression connector is affixed to a second side of the first memory circuit board. A first side of a second memory circuit board of the second DIMM is affixed to a second side of the second compression connector. The first compression connector has a first depth, and the second compression connector has a second depth that is different from the first depth.