White Paper: Electronics & Computers
How to Deploy High-speed Cable Assemblies for High Performance Computing
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High-performance computing platforms rely on high-speed cable assemblies. However, differences in Peripheral Component Interconnect Express cable designs can become a bottleneck that chokes performance. 3M’s low-profile Twin Axial Cable Assemblies are one solution that overcomes common design challenges.
This white paper compares 3M’s SI performance and describes how it supports high-performance PCIe designs with maximum integration flexibility. Read how its unique optimizations address HPC design challenges and help build HPC platforms of today and tomorrow.
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Overview
This white paper by 3M addresses the challenges of deploying high-speed PCIe cable assemblies in high-performance computing (HPC) platforms, focusing on signal integrity (SI), system design flexibility, and thermal management. As HPC systems demand greater bandwidth and reliability, effective interconnect design is critical to avoid bottlenecks. PCIe standards specify increasing data rates up to 64 GT/s per lane, but cable assemblies vary in performance and physical constraints that affect system layouts.
3M’s Twin Axial Cable Assemblies, particularly the SL8800 Series 30 AWG cable, are highlighted for their superior SI characteristics and flexible design advantages. Unlike conventional spiral-wrapped Twinax cables, 3M’s continuously laminated shield Twin Axial cables deliver low and smooth insertion loss with no resonance up to 30 GHz, ensuring minimal signal degradation even when cables are tightly folded or pre-folded. Measured impedance variation at folds is under 2 ohms, and eye diagrams remain robust, demonstrating excellent performance under system routing conditions.
The slim, flat geometry of 3M Twin Axial cables, which are less than one-quarter the thickness of equivalent discrete Twinax bundles, facilitates dense packaging and minimal airflow obstruction—key factors in thermal management for HPC systems. The cables can be pre-folded and taped into subassemblies for faster, error-resistant system build and more consistent routing. By orienting cables so their edges face airflow, designers reduce cable congestion and cooling issues compared to bulky round cables.
3M supports a range of PCIe cable form factors with x4, x8, and x16 lane counts, including jumpers and extenders using low-loss 30 or 31 AWG twin axial cables with PCIe Gen5 rated CEM connectors. These assemblies enhance design scalability and integration flexibility, enabling relocation or bridging of PCIe slots without signal compromises. Compared to rigid riser PCBs, these cable extenders offer improved SI and thermal management benefits.
In conclusion, 3M Twin Axial Cable Assemblies combine high signal integrity, low profile, foldability, and flexible routing options to meet demanding HPC interconnect needs. Their electrical precision, reduced transmission loss, and mechanical characteristics support scalable, high-density PCIe implementations, helping designers overcome airflow, layout, and performance challenges in next-generation computing systems.