Should GB300 use high-speed copper cable or optical module
The introduction of GB300 not only delivers enhanced computational capabilities but also provides a high-speed interconnect solution and a liquid-cooled optical module infrastructure for next-generation AI data centers through optimized interconnect architecture, liquid cooling systems, and energy. DACs (Direct Attach Copper) is the lowest cost, but after 2-5 meters (rate dependent) the attenuation of the signal is significant and becomes unrecognizable at the receiver. Copper cables have low cost and low power consumption and are responsible for short - distance connections; optical fibers have high bandwidth and long transmission distances and are responsible for long - distance transmission. The NVIDIA GB300 (also known as Blackwell Ultra) is a major upgrade over the GB200, delivering enhanced AI computing performance and memory capacity. Training Scenarios: The NVLink copper cables of the H100 support 900GB/s bandwidth, increasing the speed of training GPT-4 by 7 times.
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