Card-Based Processing Subsystem Airflow Design
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Solution Overview
Problem
Conventional card-based processing subsystems, such as graphics cards, face challenges in efficiently removing heat due to size limitations and airflow restrictions, leading to reduced cooling efficiency and constrained processing performance.
Innovation Solution
A card-based processing subsystem design featuring a first PCB oriented parallel to a first plane, a second PCB oriented non-parallel to the first plane, and cooling fans directing airflow through a heat sink parallel to the first plane, minimizing backpressure and enhancing airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If cooling fans are oriented facing the printed circuit board to fit within thickness constraints, then the card fits within standard PCIe slot thickness limitations, but the cooling air path is deflected 90 degrees creating substantial backpressure and reduced airflow
Solution Approach 1:
The patent reorients the cooling fan from a conventional orientation (facing the PCB) to a side-oriented position, changing the airflow direction from perpendicular to parallel relative to the PCB surface. This dimensional reorientation allows air to flow along the length of the card rather than being deflected 90 degrees, significantly reducing backpressure while maintaining compact thickness within standard PCIe slot constraints.
2Ease of operation
If the cooling air path is deflected 90 degrees by the printed circuit board, then the air flows directly onto the PCB surface, but this creates substantial backpressure and reduced airflow through the heat sink
Solution Approach 1:
Instead of having air flow perpendicular to the PCB and then be deflected 90 degrees by it, the patent inverts the approach by positioning the fan and airflow path parallel to the PCB surface. This eliminates the 90-degree deflection entirely, allowing air to flow smoothly along the card length without creating backpressure, thereby improving heat removal efficiency from the heat sink.
3Productivity
If greater airflow through the heat sink is achieved by reducing backpressure, then heat transfer from the integrated circuit improves, but the card design becomes more complex with non-parallel PCB orientations
Solution Approach 1:
The patent achieves improved heat transfer by reorienting the cooling system in a different spatial dimension. By positioning the fan and airflow path parallel to the PCB rather than perpendicular, the design achieves greater airflow through the heat sink without requiring complex multi-layer stacking or additional components. The non-parallel PCB orientation is actually simplified compared to conventional designs, as it maintains a straightforward single-sided fan mounting while achieving superior cooling performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design achieves greater airflow and heat transfer, enabling higher computing performance by reducing backpressure and improving heat removal from integrated circuits.
Implementation Method 1
at least one cooling fan that is positioned to direct a cooling fluid through the heat sink
Implementation Method 2
a heat sink thermally coupled to the processor
Data Source
AI summary
According to various embodiments, a processing subsystem includes: a processor mounted on a first printed circuit board that is oriented parallel to a first plane; a heat sink thermally coupled to the processor; a second printed circuit board that is communicatively coupled to the first printed circuit board and oriented parallel to a second plane, wherein the second plane is not parallel with the first plane; and at least one cooling fan that is positioned to direct a cooling fluid through the heat sink in a direction parallel to the first plane.