The GPU Was Never the Whole Answer

Enterprise AI is beginning to run into a problem. The infrastructure that made training possible isn’t necessarily the infrastructure that will scale inference, and that distinction is starting to matter as organizations move from experimentation into production.

What changes in that transition isn’t just scale, but workload behavior. Training is dominated by parallel compute (where GPUs excel), whereas inference — particularly during token generation — behaves very differently. Inference is a latency-sensitive, memory-bandwidth-constrained workload that general-purpose GPU architectures were not originally designed for.

This mismatch has been tolerable because inference workloads were relatively small and secondary to the training craze of the last few years. This is no longer the case. As enterprises deploy agentic workflows, multimodal applications, and high-concurrency interactive systems, inference becomes persistent and central to the application itself. At that point, inefficiencies in token generation begin to surface, not as an theoretical concern, but as something that directly impacts responsiveness, cost, and usability.

It is against that backdrop that NVIDIA introduced the Groq 3 LPX at GTC 2026. Positioned alongside the Vera Rubin NVL72 system, the LPX is a rack-scale inference accelerator built on Groq’s Language Processing Unit (LPU). While it is easy to interpret this as just another product in NVIDIA’s expanding portfolio, the more important takeaway is what it represents: an acknowledgment that enterprise AI infrastructure is not a single-architecture problem, and that GPUs alone are not sufficient to address the full spectrum of inference demands.

Understanding the LPU in Context

To understand why the LPX exists, it helps to look at how the LPU differs from a GPU at a structural level. GPUs are designed for parallel throughput, executing large numbers of operations simultaneously across sizable datasets. LPUs, by contrast, are optimized for a different objective — minimizing the time required to generate each individual token.

That design goal leads to a different set of architectural choices, particularly around memory. NVIDIA’s Rubin GPUs rely on high-capacity HBM4, delivering hundreds of gigabytes of memory with substantial bandwidth. The Groq LPU, on the other hand, uses a much smaller on-chip SRAM pool but delivers significantly higher bandwidth per byte of memory.

This tradeoff is not incidental. During inference — especially in decode — the system is repeatedly pulling data through memory, one step at a time. In that operation, memory bandwidth is more often the limiting factor than raw compute. Capacity determines whether the model and its working state can fit in memory, while bandwidth determines how quickly each token can be generated once it does.

LPX takes this approach and scales it at the rack level, combining hundreds of LPUs into a liquid-cooled system that connects directly to the Vera Rubin platform. NVIDIA is showing meaningful gains in tokens-per-second and performance-per-watt, along with improved token economics. While those figures will vary depending on workload and deployment specifics, the architectural direction aligns with a broader shift in how the industry approaches inference.

Why Disaggregated Inference Is Emerging Now

The introduction of LPX only makes sense in the context of how inference workloads are evolving. When a model handles a request, it’s really doing two different things. First, it takes in the prompt and all the context around it and processes that up front. That part is highly parallel, which is exactly where GPUs perform well. Then it shifts into generating the response, one token at a time, with each step building on the last.

Those two phases behave very differently. The first is driven by compute. The second is driven by how quickly the system can move data through memory. Trying to run both on the same architecture works, but it’s a compromise — and that compromise becomes more obvious as workloads scale.

Disaggregated inference is an attempt to deal with that directly. Instead of treating inference as a single process, it splits the phases and runs each on the hardware best suited to it. GPUs handle the parallel, compute-intensive front end, while LPUs handle the more latency-sensitive, step-by-step generation phase. NVIDIA refers to this as Attention-FFN disaggregation, but the underlying idea is straightforward: Align the architecture with the workload.

For enterprises, the impact becomes clear when inference is no longer an isolated event but part of a continuous system. In agentic workflows, where multiple inference steps are chained together, latency accumulates quickly. What feels fine in a single response starts to break down when you chain multiple steps together. At that point, it’s not just a performance issue — it becomes a cost issue, as inefficiencies drive more infrastructure and higher operating expenses.

What This Means for Enterprise IT

From an enterprise standpoint, it’s also important to recognize that LPX isn’t being positioned as something NVIDIA needs. For many use cases, especially batch-oriented or less latency-sensitive ones, the Vera Rubin NVL72 on its own is more than sufficient. LPX is really aimed at environments where responsiveness, concurrency, and user experience are critical.

This distinction reinforces that enterprise AI infrastructure will not be homogeneous. Different workloads will require different configurations, and not every organization will need — or be able to justify — the additional complexity introduced by disaggregated inference.

That complexity should not be overlooked. Splitting prefill and decode adds a layer of operational complexity. You now have to manage how requests are routed between systems and keep state, like the KV cache, coordinated across different hardware. Those details don’t show up in benchmarks, but they can have a real impact on performance and cost in production. As a result, while the architectural rationale for disaggregation is sound, the extent to which it delivers net efficiency gains will depend on how effectively these systems are implemented and managed at scale.

A Broader Shift Toward Heterogeneity

Beyond the specifics of LPX, the more significant signal I see is NVIDIA’s willingness to move beyond a single-architecture approach. For much of the past, NVIDIA’s dominance in AI infrastructure has been closely tied to the GPU and the company’s CUDA software. The company’s integration of an LPU-based system into its platform reflects a recognition that no single architecture can efficiently address all aspects of inference.

And this shift is not happening in isolation. The timing of NVIDIA’s announcement, alongside similar moves from AWS and Cerebras (see my recent analysis on that partnership), points to a broader NVIDIA alignment around the idea that inference has become the primary bottleneck and that addressing it requires specialized approaches.

At the same time, this does not indicate convergence toward a single new standard. If anything, it suggests further diversification. Inference workloads span a wide range of environments, from hyperscale datacenters to edge deployments and client devices. And each has its own set of constraints and requirements. The result is an increasingly heterogeneous landscape, where different types of accelerators coexist and are selected based on workload characteristics.

The Emerging Control Plane Challenge

All of these observations point to a rarely discussed development on the horizon. As hardware architectures diversify, the challenge shifts upward in the stack. Running inference efficiently across multiple types of accelerators, distributed environments, and varied workload profiles requires a level of orchestration that is still evolving.

Today, the building blocks exist in various forms. The pieces are there, but they’re still fairly disconnected. Orchestration frameworks handle distributed execution, serving layers that handle batching and token streaming, and data pipelines feed the models the context they need. What’s missing is a cohesive control layer that ties all of that together — a layer that can operate cleanly across different systems and architectures.

NVIDIA’s Dynamo is a step in that direction, particularly in GPU-centric environments. It brings some of that coordination together, helping manage how inference runs across systems and how state is handled along the way. However, its design remains closely aligned with NVIDIA’s ecosystem and does not yet address the broader challenge of managing inference across multiple vendors, deployment locations, and hardware types.

For enterprise environments, which will inherently be federated and multi-vendor, this gap is significant. The ability to abstract hardware differences and architectures while maintaining performance and operational visibility is likely to become one of the defining challenges of enterprise AI infrastructure.

Still Early, but Directionally Clear

The introduction of LPX and the broader Vera Rubin platform represents a meaningful step forward in inference infrastructure. The architectural logic is consistent with where the industry is heading, and the alignment across vendors reinforces that this is not an isolated development.

At the same time, it remains early. Enterprise AI deployments today represent only a fraction of what is likely to emerge over the next decade. As adoption expands, new constraints will surface — not just in compute, but in memory, networking, storage, and the software layers that tie everything together.

What NVIDIA demonstrated at GTC is less about a specific product and more about a shift in how the problem is being framed. The move toward disaggregation, specialization, and heterogeneity reflects a more grounded understanding of enterprise AI requirements. The infrastructure stack is evolving accordingly, but it is not yet complete.

The next phase of enterprise AI will be shaped less by advances in model architecture and more by how effectively infrastructure and control planes adapt to support them. And NVIDIA is leading that charge.