Conceptually, the approach is somewhat analogous to Nvidia's NVFP4 philosophy, in that both seek to achieve higher effective precision from low-precision hardware. However, the implementations are fundamentally different: NVFP4 relies on a digital floating-point representation and scaling factors, whereas the memristor SoC improves precision by compensating for analog programming errors using two programmed subarrays.
When it comes to accuracy, the SoC achieved an end-to-end inference accuracy of 80.36%, which matches the corresponding 4-bit software model. As for performance, the SoC delivers a peak throughput of 0.254 TOPS per NPU and reaches an energy efficiency of 21.3 TOPS/W at 100 MHz and 11.9 TOPS/W at 400 MHz. According to the authors, this compares favorably with published SRAM-based compute-in-memory accelerators despite being manufactured on an older 65 nm process. The SoC also exceeds Nvidia's A100 INT8 energy efficiency by an order of magnitude, the joint paper claims. Yet, these claims are largely unsubstantiated.
First up, the MobileNet demonstration does not even use all 10 NPUs. It uses one dedicated DWC NPU, five standard NPUs for pointwise layers, and leaves four standard NPUs idle. The demonstration thereby does not reveal total SoC throughput (TOPS), sustained throughput running a real network, and throughput with all 10 NPUs simultaneously saturated. In fact, the paper does not even reveal whether all 10 NPUs can be used at the same time. To that end, the 2.54 TOPS figure we mentioned earlier in the story is highly theoretical.
SK hynix, TetraMem, and researchers from the University of Southern California have developed a memristor-based IMC SoC featuring a novel depthwise convolution accelerator that improves crossbar utilization for lightweight AI workloads. The partners have managed to fabricate it using an outdated 65nm process technology and make it work, achieving a 21.3 TOPS/W energy efficiency and inference accuracy comparable to a 4-bit software model despite the fact that memristors can be programmed with a circa 2-bit accuracy. While the architecture validates that the approach works, the paper does not disclose the full performance of the SoC, and it is not clear whether the chip's 10 NPUs can be saturated at all.
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Anton Shilov is a contributing writer at Tom\u2019s Hardware. Over the past couple of decades, he has covered everything from CPUs and GPUs to supercomputers and from modern process technologies and latest fab tools to high-tech industry trends. ","collapsible":{"enabled":true,"maxHeight":250,"readMoreText":"Read more","readLessText":"Read less"}}), "https://slice.vanilla.futurecdn.net/13-4-25/js/authorBio.js"); } else { console.error('%c FTE ','background: #9306F9; color: #ffffff','no lazy slice hydration function available'); } Anton Shilov Social Links Navigation Contributing Writer Anton Shilov is a contributing writer at Tom’s Hardware. Over the past couple of decades, he has covered everything from CPUs and GPUs to supercomputers and from modern process technologies and latest fab tools to high-tech industry trends.
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