How is GPU heat removed?
The GPU produces heat. Cooling must move that heat all the way out of the system. A cool room does not prove that the path is working.
See the connection
Follow the heat out of the rack
Example: direct-to-chip cooling with a liquid-to-liquid CDU. Arrows below track heat, not the pipe layout.
Coolant picks up heat and circulates through the rack connections.
Observe: chip temperature · flow · leaksHeat crosses between two separate fluid circuits. The fluids do not mix in normal operation.
Carries the transferred heat toward the facility’s heat-rejection equipment.
Observe: supply/return temperatures · flowFollow the heat
Air-cooled equipment transfers heat into moving air. Direct-liquid cooling transfers heat from selected components through cold plates into coolant.
A manifold distributes coolant. A CDU, or coolant distribution unit, helps manage the cooling loop. Its exact role depends on the design.
Other components may still need airflow.
Read signals together
If a chip gets hot, compare its temperature with flow, supply and return temperatures, relevant pressures, and pump status. A leak alarm or missing sensor reading also needs attention.
The basic relationship is:
heat rate = mass flow × specific heat × temperature riseIllustrative water-like values of 1 kg/s, 4.2 kJ/(kg·°C), and 5°C give about 21 kW. This is not a sizing prescription.
Try it yourself
Mark a sensor and response owner at each boundary in the diagram.
Check your answer
You should know who receives a low-flow alarm and which rack it affects. Physical work, valve changes, and protection settings require qualified staff and approved procedures.