NCP-AII Exam Dumps | An AI engineer compares two HGX server configurations. One system uses only PCIe connections between

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Question 4/86

An AI engineer compares two HGX server configurations. One system uses only PCIe connections between GPUs, while the other includes NVLink and NVSwitch. During large-scale model training, the second configuration consistently finishes epochs sooner despite identical GPUs and CPUs. Which architectural feature primarily accounts for this improvement?

A. NVSwitch enables high-bandwidth, low-latency communication among all GPUs within the server.

B. PCIe automatically aggregates bandwidth across every GPU.

C. NVLink replaces system memory with GPU memory.

D. NVSwitch accelerates Ethernet routing between servers.

Correct Answer: A

NVSwitch connects every GPU within an HGX server through a high-bandandwidth fabric, allowing efficient all-to-all communication and reducing bottlenecks during collective operations.
PCIe provides lower peer-to-peer bandwidth, while NVSwitch neither replaces system memory nor manages inter-server Ethernet routing.

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