Power, Temperature, and Frequency of Ryzen 9 7900
On this page, we are going to investigate the AMD Ryzen 9 7900 power draw, temperature, and frequency. This is a stress test, which means we are pushing each CPU to its maximum potential in all-core load in Cinebench R23 multi-core test for 10 minutes.
Power
We use HWiNFO64 sensor data to record the results. We report on the sensor data for “Package Power” in Wattage.
The new AMD Ryzen 9 7900 has a TDP of 65W, while the Ryzen 9 7900X has a TDP of 170W. We can see these major TDP differences in the CPUs play out. AMD’s goal was to provide a lower TDP part in the “Non-X” CPUs, and they succeeded. The new Ryzen 9 7900 only consumed 90W package power, while the Ryzen 9 7900X consumes 201W. That is a 55% reduction in power usage!
Enabling PBO on the Ryzen 9 7900 allows the TDP to increase, and what we find is that it reaches much closer to the TDP of the Ryzen 9 7900X. That allows its performance to come very close to the performance of the Ryzen 9 7900X in our testing as was shown. This power shows what PBO can do here, it can increase the operating Wattage of the CPU to allow it to perform faster.
Temperature
We use HWiNFO64 sensor data to record the results. We report on the sensor data for “Tcidle” in Celsius.
We know that there is a big power difference between the CPUs, and we also see this represented in the temperatures. The Ryzen 9 7900X tops out at 92.8c, while the Ryzen 9 7900 is 38 degrees cooler and maxed out at just 54.3c. That is huge, this CPU would be perfect for a small form factor build, it just won’t require excessive cooling. Enabling PBO does increase temperature, as it increases power, but it still runs slightly cooler than the 7900X even with PBO enabled.
CPU Frequency
We use HWiNFO64 sensor data to record the results. We report on the sensor data for frequency in MHz. The left screenshot is the Ryzen 9 7900 at default, and the right screenshot is the Ryzen 9 7900 with PBO enabled.
From this, we can see that the Ryzen 9 7900 at default operates at 4.175GHz-4.250GHz at default. Remember, the CPU boost frequency can boost up to 5.4GHz technically, but on all-core load, this is as high as it will go when all cores are being used. When we enable PBO (in the right screenshot) we now see that it can boost up to 5.075GHz-5.125GHz. This is quite a big boost in frequency, and this is why the Ryzen 9 7900 can almost reach the performance of the Ryzen 9 7900X when PBO is enabled. It also shows that on all-core load, at default TDP, it is quite far away from its maximum boost clock. It takes PBO to get it closer to that maximum. Again, this is on an all-core load, all cores pegged in Cinebench R23.