AMD’s Ryzen 7 5800X3D, despite being based on the Zen 3 core architecture has generated a fair bit of enthusiasm from the community. The reason being: 3D V-Cache. An advanced packaging technology based on TSMC’s SoIC process, it leverages copper bonds using BPM pads interfaced with TSV. The vertically stacked SRAM die consists of 13 Cu layers and 1 layer AI metal stack. The L3 die (L3D) will add another 64MB to the already existing 32MB of CCD integrated L3 cache.
The primary application of this additional L3 cache is premier gaming performance which is known to be sensitive to the amount and latency of cache memory on the CPU. AMD’s internal figures show a massive gain of up to 40% over the Ryzen 7 5800X indicating a generational leap in gaming performance with a simple cache addition.
One of the controversies surrounding the Ryzen 7 5800X3D is the overclocking restriction. According to multiple sources, the CPU won’t be overclockable. In addition to this, it will also lack support for PBO and AutoOC which are essentially one-click overclocking/high all-core boost algorithms.
According to Yuri Bubliy, the creator of Ryzen DRAM Calculator, CTR, and Hydra, AMD has decided to disable overclocking due to thermal issues. As you can imagine, the addition of a cache die atop the existing chiplet will significantly worsen the thermal dissipation. AMD made up for this by lowering the boost clock and disabling overclocking while keeping the cache timings intact.
Bubliy believes that the Ryzen 7 5800X3D will likely be overclockable using third-party tools (and possibly custom firmware). Ryzen Master and the firmware provided by board partners, however, won’t allow conventional CPU overclocking.