AMD has chosen a conservative TjMax for its future Ryzen 7000 X3D CPUs, which have Zen 4 cores and stacked 3D V-Cache. According to Andreas Schilling of Hardwareluxx, AMD has revised the maximum temperature limit, or TjMax, of its future Ryzen 7000 X3D CPUs. The current Zen 4 series is rated at a TjMax of 95C, and while the CPUs can easily meet that target, AMD assures consumers that this type of operation is within spec. These high-temperature limitations appear to be the norm for AMD these days, since their GPUs have a peak temperature limit of up to 110C, which is called ‘Normal Spec’.
The TjMax of the AMD Ryzen 7000 X3D CPUs, which comprise the Ryzen 9 7950X3D, Ryzen 9 7900X3D, and Ryzen 7 7700X3D, is 89 degrees Celsius, which is 6 degrees Celsius lower than the TjMax of the Ryzen 7000 Non-3D CPUs. There’s a reason AMD set a lower temperature limit for its 3D V-Cache processors, and it’s also why manual overclocking isn’t supported on these parts.
AMD has set the maximum voltage of the Ryzen 7000 X3D CPUs at 1.4V, which is 0.3V more than the Ryzen 7 5800X3D.
The new CPUs will include auto OC options like PBO and Curve Optimizer, but manual overclocking will be limited due to the volatile nature of the 3D V-Cache placed on top of the single CCD. High voltages and high temperatures can both cause unexpected behaviour or even damage to the semiconductor.
The hybrid layout of twin CCD SKUs like the Ryzen 9 7950X3D and Ryzen 9 7900X3D is already optimised in Windows 11, although it remains to be seen how high temperatures will effect clock operation on these parts. To stay inside the 89C limit, you will undoubtedly need some high-end cooling solutions.
That could also explain why AMD chose a lower 120W TDP on the higher-end SKUs to keep them from utilising too much power and hitting the thermal wall. The following several weeks will be fascinating, and we can’t wait to learn more about AMD’s next generation of 3D V-Cache CPUs.
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