Power Consumption and Temperatures

The ASUS ROG Crosshair X670E HERO has two single heatsinks connected via a heatpipe, essentially acting as one larger unit. This covers the entire 18+2+2 Phase VRM setup. These are also independent heatsinks for the PCH and main M.2 socket. The remaining three M.2 sockets share a single heatsink.




For the ASUS ROG Crosshair X670E HERO thermal testing, one probe is placed along each bank of power stages. A probe is left out to log the ambient temperature. For temperature measurement, a Reed SD-947 4 channel Data Logging Thermometer is used, paired with four Omega Engineering SA1 self adhesive thermal couple probes. All temperatures are presented as Delta-T, which is the recorded temperature minus the ambient temperature as a base. The end result accounts for variation in ambient temperature, including changes over the course of a test.

Tests are conducted over a 30 minute period. For testing, the AMD Ryzen 9 7950X is used in a stock configuration. Two tests are conducted per chart. One with a fan placed on the VRM heatsinks which simulates case airflow, and another without the fan. If the heatsink has a internal fan as well, it is not disabled for these tests.


Since the Ryzen 7950X is thermally limited, overclocking was unnecessary here to show how exactly the VRM heatsink will handle a full load for an extended period of time. Using Cinebench R23 as a real-world thermal test, a fan is placed on top of the heatsink for the entire test duration to simulate high case airflow. Without the fan, as expected, VRM temps steadily increased until the end of the 30 minute test, with a 3°C gap between the two probes. 75 °C is still well within acceptable limits and shows that this motherboard can handle current or future AM5 CPUs in a stock configuration. Airflow near the VRM heatsinks of course will drastically lower the temperatures overall.


The second test was to see how the VRM heatsink may fare in games. The same results play out similar across multiple motherboards tested so far. Throughout the test, temperatures slowly rose until plateauing around 47°C after 10 minutes with little to no change afterwards. VRM temperatures while gaming, with or without airflow is perfectly fine and should not be a concern.