AMD Ryzen 7000 X3D CPUs have a Tjmax of 6C lower than 89C vs

AMD is getting a little conservative with TjMax for its upcoming Ryzen 7000 X3D CPUs that use Zen 4 cores and 3D V-Cache.

Now on their product pages AMD Ryzen 7000 X3D CPUs are listed which includes Ryzen 9 7950X3D, Ryzen 9 7900X3D and Ryzen 7 7700X3D with only 89C TjMax which is 6C less than 95C TjMax of Ryzen 7000 non-3D CPU. There's a good reason why AMD chose to use the lower temperature limit with its 3D V-Cache chips, and it's the same reason why manual overclocking isn't enabled on these parts.

As we learned yesterday, AMD has max voltage of the Ryzen 7000 X3D CPUs set at 1.4V which is 0.3V more than the Ryzen 7 5800X3D (1.1V). The new CPUs will come with auto OC options like PBO and Curve Optimizer but the reason manual overclocking is restricted is due to the volatile nature of the 3D V-Cache stacked on top of the single CCD. Both high voltages and high temperatures can lead to abnormal behavior or even damage to the chip.

Hybrid layout for dual CCDs such as the Ryzen 9 7950X3D & Ryzen 9 7900X3D has already been improved in Windows 11 but it remains to be seen how higher temperatures will affect clock operation in these parts. You will definitely need some high-end cooling solutions to stay within the 89°C limit. This may also explain why AMD chose to go with a lower 120W TDP on higher quality SKUs to reduce excess power usage and thermal wall running. The next few weeks are going to be very interesting and we can't wait for AMD to dig deeper into the next iteration of 3D V-Cache CPUs.