From Tom's Hardware: Data center GPUs from Nvidia have become the gold standard for AI training and inference due to their high performance, the use of HBM with extreme bandwidth, fast rack-scale interconnects, and a perfected CUDA software stack. However, as AI becomes more ubiquitous and models are becoming larger (especially at hyperscalers), it makes sense for Nvidia to disaggregate its inference stack and use specialized GPUs to accelerate the context phase of inference, a phase where the model must process millions of input tokens simultaneously to produce the initial output without using expensive and power-hungry GPUs with HBM memory. This month, the company announced its approach to solving that problem with its Rubin CPX— Content Phase aXcelerator — that will sit next to Rubin GPUs and Vera CPUs to accelerate specific workloads.
The shift to GDDR7 provides several benefits, despite delivering significantly lower bandwidth than HBM3E or HBM4; it consumes less power, costs dramatically less per GB, and does not require expensive advanced packaging technology, such as CoWoS, which should ultimately reduce the product's costs and alleviate production bottlenecks.
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