Pulse Virus

Overview

The pulse_virus does not test sustained heat; it tests electrical transients. It induces maximum dI/dt (Change in Current over Time) to stress the power supply and voltage regulators.

Execution Mechanics

The test toggles the GPU at exactly 10Hz between two extreme states:

1. The Spike: Launches a massive wave of FMA math to instantly spike the GPU to 100% load.
2. The Droop: Immediately issues a 50-millisecond sleep command, dropping the GPU load to 0% and forcing the VRMs to rapidly cut voltage.

Target Subsystems

• Primary Target: GPU VRMs (Voltage Regulator Modules) and motherboard PCIe power delivery.
• Secondary Target: Host Power Supply Unit (PSU) transient response.

Failure Symptoms

Critical Failures

• Instant System Shutdown: The rapid power draw spikes trigger the PSU's Over-Current Protection (OCP), completely cutting power to the server.
• Audio Crackling / USB Drops: The motherboard's 12V rail becomes unstable under the transient load, temporarily disabling peripheral devices.