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AMD Ryzen 9 7950X and Ryzen 5 7600X thermals are reportedly out of control at 95 C and 90 C respectively as the Core i9-13900K runs comparatively cooler

AMD Zen 4 CPUs could be difficult to cool even with AIOs. (Source: Cullan Smith on Unsplash/AMD-edited)
AMD Zen 4 CPUs could be difficult to cool even with AIOs. (Source: Cullan Smith on Unsplash/AMD-edited)
AMD Zen 4 processors are slated to bring incredible performance gains over the Zen 3 Ryzen 5000 parts. But, if a series of recent leaks are accurate, the Ryzen 7000 CPUs become meltingly hot when pushed. On the other hand, Raptor Lake chips are allegedly free from thermal troubles compared to their Zen 4 rivals.

AMD took the wraps off the Zen 4 Ryzen 7000 CPUs on August 29. The series which include the Ryzen 9 7950X (16 cores/32 threads), the Ryzen 9 7900X (12 cores/ 24 threads), the Ryzen 7 7700X (8 cores/ 16 threads), and the Ryzen 5 7600X (6 cores/12 threads). The CPUs offer substantial performance improvements over their predecessors while being much smaller. But, according to Chinese hardware leaker Enthusiast Citizen, the performance of the Zen 4 CPUs comes at a huge thermal cost.

Posting over at Bilibili, Enthusiast Citizen reports that the Ryzen 9 7950X will lose to Intel Raptor Lake in multi-core “with no suspense”. As the chip produces 95 C under load, the leaker maintains that the Zen 4 flagship will reach thermal threshold and throttle to less than 5 GHz at 230 W. The 6-core Ryzen 5 7600X also doesn’t fare any better according to the leaker as it shoots up to 90 C while consuming 120 W.

Substantiating Enthusiast Citizen’s report, Wccftech mentions hearing from one of their sources that the heat output of the AMD Ryzen 9 7000 series CPUs stands between 92-94 C even with a “high-end 360 mm AIO liquid cooler” in AIDA64.

On the other hand, the Intel Raptor Lake Core i9-13900K allegedly produces a much lower 82 C while consuming 40 W more at 270 W. To prove how much cooler the Raptor Lake CPUs run, Enthusiast Citizen also showcased an engineering sample of a Core i7-13700K running at a sustained 5.3 GHz on all P-cores while coming around 81 C.

Assuming these readings are true, the question is: Why do the Zen 4 processors produce so much heat? Leaker @harukaze5719 might have some answers for us.

First, the Zen 4 chips are not only smaller than the Zen 3 parts but also pack considerably more transistors, resulting in a significantly increased heat output per mm2. @harukaze5719 shows this in a chart where Zen 4 SKUs have the highest W/mm2.

In other words, one reason why the Ryzen 9 7950X and the Ryzen 5 7600X get so toasty is that it is pretty hard to move heat away from such dense, small chips. This would also explain AMD’s decision to use gold-plating in the Zen 4 chips to dissipate heat faster.

Another reason can be faulty BIOS. Per @harukaze5719, the Ryzen 7000 CPUs do run quite hot at stock settings under load. The CPUs reportedly downclock too much and take too high of a voltage. But once you manually adjust VCore, not only does the temperature drop significantly, but the CPU also retains the clock speed. The leaker showcases two AIDA64 charts depicting this. One chart displays an unnamed Ryzen 7000 CPU clocked around 5 GHz operating at a whopping 93.1 C while using 122.212 W. The other chart shows the heat output drop from 93.1 C to 56.5 C and clock frequency remaining at 5 GHz while the power draw is reduced almost by 50% to 67.924 W after manual VCore adjustments.

Finally, it is important to remember that Enthusiast Citizen tested the ES/QS of Zen 4 CPUs. So, take these thermal performance results with a grain of salt.

Buy the AMD Ryzen 5 5600X on Amazon

Core i7-13700K thermals. (Source: Enthusiast Citizen)
Core i7-13700K thermals. (Source: Enthusiast Citizen)
Thermal density comparison of Zen 4 vs Intel chips. (Source: @harukaze5719)
Thermal density comparison of Zen 4 vs Intel chips. (Source: @harukaze5719)
Stock Ryzen 7000 CPU vs manual VCore adjustments. (Source: @harukaze5719)
Stock Ryzen 7000 CPU vs manual VCore adjustments. (Source: @harukaze5719)
 

Source(s)

Enthusiast Citizen on Bilibili, Wccftech, @harukaze5719 (1,2,3), Teaser image: Cullan Smith, AMD (edited)

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> Notebook / Laptop Reviews and News > News > News Archive > Newsarchive 2022 09 > AMD Ryzen 9 7950X and Ryzen 5 7600X thermals are reportedly out of control at 95 C and 90 C respectively as the Core i9-13900K runs comparatively cooler
Fawad Murtaza, 2022-09- 2 (Update: 2022-09- 2)