Ryzen 7 5800X3D is an 8-core, 16-thread CPU with a base clock of 3.4Ghz and a maximum boost clock of 4.5Ghz. The chip has an insane 96MB of L3 Cache, thanks to the 3D V-Cache technology that allows AMD to stack this extra memory on top of the Zen3 cores inside the CPU. Apart from that, the 5800X3D is identical to a standard Ryzen 7 5800X, with the only difference being the higher price tag. AMD claims that the extra cache helps the 5800X3D offer even better gaming performance than the Ryzen 9 5900X, 15% to be precise.
After previous rumors suggested that AMD won’t enable overclocking support for its upcoming flagship chip, the Ryzen 7 5800X3D, today we got official confirmation. AMD’s Director of Technical Marketing, Robert Hallock, sat down with HotHardware on YouTube to give a deep dive interview for Ryzen 6000 Zen3+ laptop APUs, where a chat member asked whether the 58000X3D will support overclocking or not. Attached is Robert’s response:
First and foremost, Robert confirms that the Ryzen 7 5800X3D, in fact, does not support core frequency overclocking or voltage adjustment. Those two are what we commonly refer to as CPU overclocking in general, increasing the clock speed along with the voltage to the point where we find a nice balance between the two and achieve maximum performance. This is disabled on the 5800X3D from the factory.
The reason being that the extra 64MB of cache stacked vertically on top of the core chiplets inside the 5800X3D has different voltage and frequency scaling than what the market is normally accustomed to. Where AMD chips usually top out at around 1.45V – 1.5V, the 3D V-Cache inside the 5800X3D maxes out at 1.35V which limits the overall voltage of the chip.
This is also the reason as to why the 5800X3D has lower clock speeds than the standard 5800X without 3D V-Cache, 400Mhz slower base clock and 200Mhz slower boost clock to be exact. So, if you try to go past that 1.35V limit, there is a chance that you would end up just breaking it due to unstained voltage curves beyond the chip’s maximum capacity.
AMD have enabled a hard-lock for overclocking in the BIOS/UEFI of the chip itself and urged motherboard manufacturers/partners to not offer any kind of overclocking support in their products. Robert did confirm that even if someone did try to go rogue, they won’t be able to as the disabled overclocking is “lock lock” that cannot be bypassed no matter what.
All that being said, memory and Infinity Fabric (FLCK) overclocking support will remain enabled as Robert notes, “we know our parts get the most benefit from that anyways“. Therefore, even though it’s a bit disappointing that AMD’s next best-in-class chip cannot be overclocked, it’s for good reason and the areas where a more significant performance gain can be achieved (memory and FLCK) remain untouched for your maximum overclocking desires.
No overclocking for a reason
Robert mentioned that AMD had a choice to make with the 3D V-Cache technology. Either ship a CPU with it right now and enjoy the massive technological advantages, or wait for the tech to mature over time and release a CPU later down the line that does support overclocking. As you can tell, they made the choice and the 5800X3D will be available in markets from April 20th, starting at $449.
Since the 5800X3D is the company’s first CPU with 3D V-Cache, it will take some time for the technology to mature which will then allow AMD to release future chips with overlocking enabled. Robert made sure to reiterate that disabling overclocking on a Ryzen part does not indicate any kind of new direction for Ryzen as a whole, it just pertains to the 5800X3D part which will run at its maximum 1.35V limit out of the box, so allowing overclocking did not make sense.
As Robert made clear and as we already know, AMD’s upcoming CPUs, in this case the Zen 4 desktop refresh scheduled for a H2 2022 release, will most likely come with 3D V-Cache as default on all chips in the lineup. In many ways, the 5800X3D was a real-world test for AMD to pilot this technology before making it mainstream in all their future CPUs, which means that by the time AMD’s next big refresh is here, 3D V-Cache would’ve matured to the point where overclocking would be possible.