The AI inference process involves two distinct phases: "prefill" (reading the prompt, which is compute-bound) and "decode" (writing the response, which is memory-bound). NVIDIA GPUs excel at prefill, while companies like Grok optimize for decode. The Grok-NVIDIA deal signals a future of specialized, complementary hardware rather than one-size-fits-all chips.

Existing AI chips force a trade-off: high-throughput HBM memory (NVIDIA, Google) has high latency, while low-latency SRAM memory (Grok) has poor throughput. MatX's architecture combines both, putting model weights in fast SRAM and inference data in high-capacity HBM to achieve both low latency and high throughput.

SambaNova avoids direct, broad competition with Nvidia by differentiating itself in "premium inference." This niche focuses on enterprise use cases where ultra-low latency and high performance are critical, such as rapid agent-to-agent communication, creating a defensible market for its specialized hardware.

AI workloads are limited by memory bandwidth, not capacity. While commodity DRAM offers more bits per wafer, its bandwidth is over an order of magnitude lower than specialized HBM. This speed difference would starve the GPU's compute cores, making the extra capacity useless and creating a massive performance bottleneck.

The next wave of AI silicon may pivot from today's compute-heavy architectures to memory-centric ones optimized for inference. This fundamental shift would allow high-performance chips to be produced on older, more accessible 7-14nm manufacturing nodes, disrupting the current dependency on cutting-edge fabs.

NVIDIA's approach requires connecting thousands of Grok chips, creating latency bottlenecks. Cerebras's CEO argues its single, integrated wafer-scale system avoids this "interconnect tax," offering superior memory bandwidth and performance for massive models by eliminating the wiring between thousands of tiny chips.

Despite its high valuation post-IPO, AI chipmaker Cerebras's long-term strategy focuses on inference, not just training. The bet is that inference will become a much larger segment of the AI compute market. By developing chips specifically optimized for this task, Cerebras aims to take significant market share from NVIDIA.

Model architecture decisions directly impact inference performance. AI company Zyphra pre-selects target hardware and then chooses model parameters—such as a hidden dimension with many powers of two—to align with how GPUs split up workloads, maximizing efficiency from day one.

Unlike GPUs using slow, dense memory, Cerebras's wafer-sized chip leverages its vast surface area to accommodate faster, less-dense memory. This design sidesteps memory bottlenecks, achieving speeds up to 15 times faster than the fastest GPUs for AI tasks.