Voltage as Performance
Compute Jitter.
When we talk about AI performance, we usually focus on the **Network** (latency, bandwidth) or the **Chip** (HBM3, TFLOPS). But there is a third, silent layer: the **Electrical Fabric**.
Modern GPUs can swing from 50W to 700W of power consumption in *microseconds*. This creates **Transient Voltage Spikes** across the server's VRMs (Voltage Regulator Modules). If the rack's power delivery is 'noisy' or slow to respond, the GPU slightly drops its clock speed or increases its retry-logic, leading to **Compute Jitter**.
Line Noise
Harmonic distortion on the DC bus can interfere with high-frequency SerDes signals, causing Bit Error Rates (BER) to spike on PCIe 5.0 lanes.
Thermal Drift
As VRM efficiency drops due to heat, the GPU must adjust its 'Max-P' state to stay within the power envelope, creating latency variations.