Rapid advances in AI computing, big data analytics, and cloud technologies are pushing the limits of the power systems that support them. NVIDIA’s new GB300 supercomputing module delivers 1.5× the performance of the GB200, with power consumption increasing from 1,200W to 1,400W. The NVL72 system rack, built from a stack of GB300 modules, houses 72 GPUs and 36 CPUs, drawing roughly 120–130kW. When multiple racks are deployed, the total system power can reach megawatt levels. These systems use liquid cooling to achieve high-density and high-performance output.
This evolution is driving a shift in AI server power architectures from traditional 12V to 48V, 54V, ±400V, and even 800V high-voltage designs. Compared with 12V architectures, which suffer increased resistive losses (I2R) and lower efficiency due to the larger current required to deliver power, high-voltage systems effectively reduce power loss and improve overall energy efficiency. As a result, high-voltage has become the mainstream direction for AI server power systems.
From a testing perspective, whether it’s a power supply unit (PSU) rated at tens of kilowatts, a power shelf at hundreds of kilowatts, or a power rack reaching megawatt levels, all must meet stringent transient response and current slew rate requirements. To meet these testing demands, the Chroma 63200A DC Electronic Load series offers single-unit power ratings from 2kW to 24kW, and supports synchronous dynamic operation of up to 60 units for a maximum rated power of 1.44MW. This comprehensive solution covers testing needs from PSU to power rack.
1.44MW Electronic Load Testing Solution
Chroma has worked with several world-leading power manufacturers and cloud service providers to build AI server power testing platforms, drawing on extensive experience in site planning from kilowatt to megawatt scale.
Beyond providing equipment, Chroma offers professional site evaluation and consulting services covering heat dissipation for hundreds of kilowatts, equipment placement, thermal zoning and isolation, airflow planning, and 3D temperature simulation of the testing environment. These services help users identify risks early and conduct thorough assessments before installation.
To enhance usability, operators can configure and control the testing process intuitively using the SoftPanel graphical interface software, or integrate the system with the Chroma 8000 Automated Test System for centralized control. Dedicated drivers are also available, allowing users to write custom programs to control the load and automatically distribute test conditions across multiple system racks.
All of these tools support constant current mode, programmable load sequencing, and other advanced features to meet diverse testing requirements.