Inside a Compact Intel 3000 W Water-Cooled Power Supply

Why It Matters

The PSU demonstrates how advanced wide‑bandgap semiconductors and liquid cooling can enable high‑density, high‑efficiency power delivery for modern servers, influencing future data‑center power architectures.

Key Takeaways

• Intel 3 kW PSU uses water cooling for compact design
• Interleaved totem‑pole PFC with 600 V GaN FETs
• Phase‑shifted full‑bridge uses SiC cascode JFETs
• 12 V output at 250 A; 48 V DC reduces current
• Design oddities include ineffective Kelvin source connection

Pulse Analysis

The relentless drive for higher compute density in data centers has forced power designers to rethink traditional air‑cooled architectures. Intel’s 3 kW water‑cooled reference supply illustrates a pragmatic response: by submerging a sizable copper block directly onto the power stages, thermal resistance drops dramatically, allowing a compact footprint without sacrificing reliability. This approach aligns with the broader industry move toward liquid‑cooled racks, where coolant distribution replaces fans as the primary heat‑removal mechanism. The result is a power module that meets 80 Plus Platinum standards while fitting into space‑constrained server chassis, a combination previously achievable only with larger, multi‑unit systems.

At the heart of the unit are wide‑bandgap devices that push efficiency beyond the limits of silicon. The interleaved totem‑pole PFC stage employs 600 V GaN FETs from Texas Instruments, offering low on‑resistance and fast switching that reduces conduction losses. Downstream, the phase‑shifted full‑bridge utilizes SiC cascode JFETs, a hybrid that merges the high current density of JFETs with the gate control of a low‑voltage MOSFET. This topology delivers tight voltage regulation and minimal switching noise, essential for server‑grade power quality, though the teardown noted a mis‑wired Kelvin source that nullifies a temperature‑sensing feature.

The design choices reflected in this PSU signal a shift in data‑center power strategy. Delivering 12 V at 250 A translates to a massive 3000 W, but moving to 48 V DC would cut the current to roughly 62 A, easing conductor sizing and reducing I²R losses. As telecom and cloud operators adopt higher bus voltages, water‑cooled, GaN‑SiC hybrids become attractive for their compactness and efficiency. The lack of pre‑teardown performance data underscores the need for thorough validation, yet the insights gained provide a roadmap for next‑generation high‑power supplies that balance thermal management, semiconductor advances, and evolving voltage standards.