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defines it “the elephant in the room” AMD and, undoubtedly, this is a theme that has arisen since the first reviews of the Ryzen 7000: we are talking about 95°C than the new desktop CPUs they reach under multi-threaded load. To talk about it in a post is Don Woligroski, a leading figure in the marketing department of the US company.
“All quality testing of Ryzen 7000 desktop processors was performed at 95°C. The chip is designed to last a long time at this temperature without compromising longevity or reliability. In fact, this is the same design goal we’ve had for a number of product generations, but it wasn’t until the Ryzen 7000 series that the platform had access to a level of socket power that makes 95C the temperature that provides maximum performance during multi-threaded loads”.
In short, the behavior of the Ryzen 7000s is intended, the processor was created to push itself to the maximum power and temperature limits as quickly as possible because that is its “habitat” in which it returns the best performance. The two main limitations are socket power (PPT, which varies between 88 and 230 W depending on the processor) and temperature (TjMax, which is 95 °C for all Ryzen 7000s).
Within bounds, the algorithm Precision Boost 2 it moves autonomously by detecting data from multiple telemetry sensors in order to dynamically control the behavior of the boost. “The goal of PB2 is to maximize performance while staying within the limits of five main factors: maximum socket power (PPT), sustained current (TDC), peak current (EDC), temperature (TjMax) and voltage”.
|
TDP
|
PPT limit
|
TDC limit
|
edc
|
voltage range
|
TjMax CPU
|
|
65W
|
88W
|
75A
|
150A
|
.0650-1.45
|
95°C
|
|
105W
|
142W
|
110A
|
170A
|
.0650-1.45
|
95°C
|
|
170W
|
230W
|
160A
|
225A
|
.0650-1.45
|
95°C
|
The PB2 algorithm is the same as the Ryzen 5000, but with respect to that CPU family what changes is the arrival of models with TDP of 170Wpreviously absent. “None of the above values can be exceeded at standard settings with PB2. Our processors are designed to take full advantage of these power and thermal ranges to deliver maximum performance for a given workload.”
As we saw in the test of the first Ryzen 7000 CPUs, under multi-threaded load the new solutions rise up to 95 °C, remaining stable, despite a 360 mm AIO liquid cooler. The top of the previous generation range, the Ryzen 9 5950X, stops at lower temperatures.
“The reason for the difference is not a change in how PB2 works, but a result of more power to the socket. Simply put, a Ryzen processor will push performance until it hits a power or temperature limit. The Ryzen 5950X was limited by the PPT of 142W before hitting its temperature limit, while the Ryzen 7950X has more power, so it will hit its temperature limit before hitting its 230W PPT limit“.
In the post, Woligroski explains that – and it’s hardly a surprise – it would be better to use liquid cooling for CPUs like the Ryzen 9 7900X and Ryzen 9 7950X, especially in cases with high internal temperatures, “but that doesn’t mean they can’t be used with air solutions“. A graph compares the temperatures recorded by the 7950X against a NZXT Kraken X63 and an AMD Wraith Prism:
Ryzen 7000s scale up to 95°C under multi-threaded load regardless of heatsink. “Thermically, there is no difference. However, performance-wise, there is a slight difference in multi-threaded workloads,” Woligroski explains with a second graph. “Regardless of the cooling system or the thickness of the IHS, this is the chip’s target for best performance.”
Finally, AMD reminds:
- 95 °C is an absolutely safe temperature for Ryzen 7000 processors for the life of the product
- 95 °C is the target for these processors when you get maximum multi-threaded performance
- Better cooling systems mean better performanceBut that doesn’t mean you won’t get a great experience out of your latest generation air cooler
- Don’t confuse the measured temperature with the heat produced by the CPU, because the heat is a pure function of power draw
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