AMD’s Ryzen 7 7800X3D will have a boost clock of over 5GHz, a notable uplift from the 4.5GHz upper limit on the 5800X3D. The Zen 3 V-Cache part doesn’t support conventional CPU overclocking and has a peak clock 100-200MHz lower than the 5800X. The reason is that stacking an L3 chiplet atop the CCD significantly worsens thermal dissipation.
With Zen 4 and TSMC’s 5nm process node this time, it’ll be an even more significant challenge to cool the V-Cache processors. According to HXL on Twitter, the Ryzen 7000X3D CPUs will feature boost clocks of over 5GHz. We already know that the Zen 4D chips will feature a more mature implementation of the V-Cache technology across a wider portfolio. You can expect the Zen 4 X3D family to consist of the Ryzen 7 7800X3D, Ryzen 9 7900X3D, and the 7950X3D.
It’s unclear whether the Ryzen 9 SKUs will feature multiple 3D stacked or a single denser die, but in the former case, the boost clocks on them will be lower than the 7800X3D. AMD should launch the Ryzen 7000X3D CPUs in December or January (during CES 2023).