Challenging PC Layout Norms
Desktop PCs have evolved standardized layouts over decades of optimization. However, hardware enthusiast TrashBench has demonstrated that ignoring accepted norms of GPU placement can deliver up to a 19°C hotspot temperature reduction, though initial tests adversely impacted CPU temperatures. Further adjustments ultimately achieved a 14°C reduction in GPU hotspot temperatures alongside a 3.3°C cooler CPU.
The testing methodology began with a conventional baseline setup featuring an RTX 3080 desktop PC. The CPU was cooled by a 360mm AIO liquid cooler, and the triple-fan RTX 3080 graphics card was installed directly into the standard PCIe expansion slot.
This baseline configuration was subjected to a constant thermal load by looping 3DMark Time Spy and running the 7-Zip built-in benchmark. System fan speeds were locked to ensure consistent airflow measurements during the experiment.
Alternative Configurations
The modder tested multiple alternative orientations, placing the GPU at the bottom of the case and mounting it vertically against the side intake fans in various configurations. The CPU AIO cooler radiator was also tested in both exhaust and intake orientations to evaluate thermal trade-offs.
Finding the Optimal Thermal Balance
While early alternative layouts prioritized either GPU or CPU cooling exclusively, subsequent testing identified configurations that provided balanced thermal improvements for both major components simultaneously.
The Final Sweet Spot Layout
The optimized cooling design featured the CPU mounted vertically directly against the side intake fans, paired with the CPU AIO radiator configured in a traditional exhaust setup. This balanced layout successfully delivered a 3.3°C cooler CPU while chilling the GPU hotspot by 14°C.
Executing similar custom GPU repositioning experiments requires flexible PCIe riser cables in various lengths to connect components securely across non-standard chassis locations.
