Laser Cold Plates: Cooling Laser Diodes and Optical Modules with Tight Temperature Stability
A server CPU cold plate has a simple job: keep the chip below its temperature limit. A laser cold plate has a harder one. It has to remove heat and also keep the laser sitting at the same temperature, hour after hour. That’s because a semiconductor laser’s wavelength moves with temperature. For a pump laser […]
Thermal Interface Materials for Liquid Cold Plates: Paste, Pads, Phase-Change and Liquid Metal Compared
Introduction Cold plates keep getting better: finer channels, thinner bases, flow aimed right at the hot spots. Yet plenty of engineering teams mount a new sample, power it up, and find the chip running hotter than the numbers promised. Often the culprit isn’t the cold plate. It’s the thin layer between the cold plate and […]
Liquid Cooling Quick Disconnects for Cold Plates: UQD v2, Blind-Mate, and How to Specify Them
AI rack power keeps climbing, and cold plate loops keep getting denser. In a typical 8-GPU server, the cold plates, in-server tubing, rack manifold, and CDU form one technology cooling system (TCS) loop. The moment that server needs to come out for service on its own, the loop needs a connection that can be broken […]
Direct-to-Chip Coolant Guide: PG25 vs. Deionized Water, Water Quality and Galvanic Corrosion Control
AI chip power keeps climbing with every generation, and the channels inside direct-to-chip cold plates keep getting finer. Engineers at Motivair, part of Schneider Electric, note that fin spacing in today’s cold plates is around 50 microns, and future designs may go tighter. In passages that narrow, a few particles, a thin biofilm, or a […]
What Is a Two-Phase Cold Plate? Pump-Driven Two-Phase Direct-to-Chip Cooling Explained
Leading AI accelerators now carry thermal design power ratings above 1,000 W, and a single-phase cold plate has one main lever for keeping up: more flow. More flow means more pump power, more pressure drop, and bigger plumbing. Two-phase cold plates take a different route. They let the working fluid boil inside the plate and […]
IGBT Cold Plates: A Design and Selection Guide for IGBT and SiC Power Modules
Introduction EV traction drives, solar and energy storage power conversion systems (PCS), wind converters, industrial motor drives—they’re all heading the same direction: more power in the same enclosure. As power density climbs, losses concentrate in fewer square centimeters, and the cooling margin keeps shrinking. Silicon carbide makes the problem sharper. For the same current rating, […]
NVIDIA Cold Plates Explained: How GPU Liquid Cooling Evolved from H100 to Blackwell (B200/GB200)
Reviewed by APALTEK’s thermal engineering team · Last updated: October 2026 Introduction In 2022, NVIDIA built direct-to-chip liquid cooling into one of its own PCIe data center GPUs for the first time. The pitch was simple: same performance, less power, less rack space. Liquid cooling was an option, and the NVIDIA cold plate was an […]
Cold Plate vs. Vapor Chamber vs. Heat Sink: Which Cooling Method Fits Your Heat Load?
Introduction Chip power climbs with every generation, and thermal design reviews keep getting longer. One question comes up in almost all of them: should this chip get a vapor chamber or a cold plate? That’s the cold plate vs. vapor chamber question, and it’s only half right. A vapor chamber and a cold plate don’t […]
Liquid Cold Plate Design Calculations: Heat Load, Flow Rate (L/min per kW) and ΔT
On a lot of data center liquid cooling projects, the numbers don’t line up. The CDU and rack manifold get sized to the rack’s total kilowatts. The cold plate supplier quotes thermal resistance for a single chip, measured under its own test conditions. Nobody notices the mismatch until power-on, when one GPU runs noticeably hotter […]
Cold Plate Thermal Resistance Explained: What °C/W Means and How to Read a Datasheet
You’re holding two cold plate datasheets. Both list 0.02 °C/W, so on paper they’re a tie. Then you mount them on the same chip, and one keeps junction temperature comfortably in spec while the other starts throttling under full load. The cold plates usually aren’t the problem. The number is. Behind every cold plate thermal […]