Blow-through Axial Fan for GPU Cooling
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Solution Overview
Problem
Conventional graphics subsystems are limited in cooling high-frequency GPUs due to the physical constraints of the PCIe slot, preventing the use of larger fans that could provide more effective air circulation and leading to overheating issues.
Innovation Solution
A graphics subsystem design featuring a shortened printed circuit board with a heat sink extending beyond its edge, utilizing a first fan outside the board boundary and a second fan within the boundary to create unimpeded airflow paths with low pressure and high flow rates, enhancing convective cooling by mixing airflows and reducing recirculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a larger fan is used to increase air circulation rate for cooling, then cooling effectiveness is improved, but the device cannot be accommodated within the PCIe slot form factor
Solution Approach 1:
The cooling system is segmented into two separate fans: a first fan positioned outside the PCB boundary and a second fan positioned within the PCB boundary. This segmentation allows each fan to serve a specific cooling function while accommodating the overall size constraints of the PCIe slot form factor.
Solution Approach 2:
The first fan is positioned in a different spatial dimension (outside the PCB boundary) rather than competing for space within the standard PCIe slot footprint. This dimensional relocation enables access to additional cooling capacity without increasing the occupied slot area.
2Productivity
If GPU operates at higher frequency for better performance, then processing capability is improved, but heat generation increases requiring more effective cooling
Solution Approach 1:
The cooling function is segmented between two fans with different airflow characteristics. The first fan creates low-pressure high-flow airflow for overall cooling, while the second fan provides additional cooling support, together enabling adequate heat dissipation for high-frequency GPU operation.
Solution Approach 2:
The system changes the airflow parameters by using two fans with different pressure-flow characteristics. The first fan operates at low pressure with high flow rate, creating an unimpeded airflow path that enhances convective cooling capability for high-performance GPUs.
3Productivity
If conventional single-fan design is used to simplify structure, then device complexity is reduced, but cooling capability is insufficient for high-performance GPUs
Solution Approach 1:
The cooling system is divided into two functional segments: the first fan handling primary cooling with unimpeded airflow paths outside the PCB, and the second fan providing supplementary cooling within the PCB boundary. This segmentation achieves enhanced cooling capability while maintaining relatively simple individual fan designs.
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
Enables the integration of higher performance GPUs without overheating risks, as the design achieves greater convective cooling capabilities compared to conventional systems.
Implementation Method 1
The fan simultaneously circulates air across the cooling fins in order to provide a convective cooling effect that increases the rate of heat dissipation
Implementation Method 2
The fan is typically disposed proximate to the heat sink and configured to direct airflow towards the cooling fins
Implementation Method 3
the heat sink is configured to extract heat generated by the GPU and to dissipate that heat into the general environment via the cooling fins
Data Source
AI summary
A graphics subsystem includes a printed circuit board (PCB), a set of one or more fans, and a heat sink. A graphics processing unit (GPU) is integrated into the PCB. The PCB is shortened to occupy a portion of the width of the graphics subsystem. The heat sink is coupled to the PCB and/or GPU and configured to extend beyond an edge of the PCB, thereby occupying a larger portion of the width of the graphics subsystem compared to the PCB. A first fan is disposed partially or fully beyond the edge of the PCB and is configured to direct air through the portion of the heat sink that extends beyond the edge of the PCB, along a first airflow path, and out of the graphics subsystem. A second fan is configured to direct air through the heat sink, along a second airflow path, towards the GPU.