Overcoming AI Server Power Limits: kt cloud Focuses on 800V DC Data Centers

With the spread of AI technology, the power density of next-generation AI accelerator racks such as NVIDIA GB200 NVL72 is rapidly increasing. The existing AC power distribution method requires large amounts of copper to supply low voltage (54VDC) and increases PSU footprint, facing limitations in terms of space efficiency and cost.

The 800V DC power distribution method is emerging as an alternative to resolve this bottleneck. While existing AC systems lose significant energy through the complex conversion process of 'AC → DC → AC → DC', DC distribution can dramatically reduce the number of conversion steps, improving energy efficiency by about 24%.

In addition, with fewer components, the Mean Time Between Failures (MTBF) is extended, increasing system availability. As the conversion process is reduced, heat generation is also suppressed, offering the advantage of reducing the power required for cooling systems as well.

However, to implement this, building an industry ecosystem—including standardization of the 800V specification and high-voltage DC circuit breaking technology and safety design—remains an essential challenge.