Deep-Dive: Etched Sohu ASIC Microarchitecture & Rack Power
An architectural deep-dive into how Etched Sohu ASIC hardwires transformer attention into custom silicon, drastically reducing memory bandwidth constraints.
Eliminating Instruction Fetch overhead in Transformer Kernels
Underlying the Etched Sohu processor is an uncompromising silicon design philosophy: eliminate the general-purpose SIMD execution pipelines found in standard GPUs. By replacing flexible CUDA cores with dedicated matrix-multiplication blocks and hardwired Softmax/LayerNorm pipelines, the chip avoids dynamic instruction decoding overhead during inference.
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Rack-Scale Optical Interconnects and Liquid Cooling Integration
Sohu pairs its custom logic cores with a massive 144MB ultra-fast SRAM buffer directly adjacent to the compute units, backed by HBM3e stacks. This hybrid memory hierarchy ensures KV-cache tokens remain in high-speed local memory during long-context generation, preventing memory bus saturation during multi-turn conversational requests.
At the rack scale, Etched employs direct-to-chip liquid cooling plates and co-packaged optical interconnects. This design enables 32-node racks to function as a single logical inference domain, achieving microsecond inter-chip communication without Ethernet packet overhead.