According to The Next Platform, Cerebras has overclocked its WSE-3 waferscale engine for the new CS-4 system, which carries the name 'Nexus.' The move is intended to strengthen how quickly the system can run inference workloads.
Overclocking a waferscale processor is notable because the WSE-3 already spans an entire wafer and is built around very high bandwidth. Rather than adding more silicon or memory, Cerebras is pushing the existing chip faster to extract additional inference performance.
The CS-4 is positioned as the platform that takes advantage of these higher clocks. The report does not mention trade-offs, but the focus is squarely on using the overclocked WSE-3 to give the system more inference capability.