We mentioned that before the Ryzen 7 5800X3D was introduced, it might lack overclocking capability. Afterwards, AMD officials made statements confirming these rumors. Yes, the 5800X3D based on 3D V-Cache technology will not support overclocking in the first stage. However, a YouTuber named SkatterBencher was able to overclock the processor, despite being locked out by AMD recently.
AMD doesn’t provide exact details as to why 3D V-Cache prevents overclocking, but there are a few variables that could potentially cause problems. One of the main side effects of adding 3D V-Cache is temperatures. Adding extra cache directly to the processor means it will run hotter compared to traditional Ryzen 5000 CPUs.
Another factor may be related to the voltage sensitivity of the 3D V-Cache. AMD has limited the 5800X3D to a maximum VID voltage of 1.35v, which is significantly less than the 1.5v that other Ryzen 5000 chips can handle under optimum conditions.
Conditions aside, overclockers somehow manage to circumvent all these throttling. The core multiplier is disabled, along with Precision Boost Overdrive and Curve Optimizer. Therefore, there was only one option for adjusting clock speeds: base clock (BCLK) overclocking. To summarize, the BCLK multiplier is controlled by the motherboard, not the CPU.
BCLK frequency determines the frequency baseline for all other components on the motherboard, including RAM, USB ports, PCIe slots, SATA drives, NVMe drives, and more. When you overclock the BCLK, we are overclocking not only the CPU, but also other motherboard components that reference the BCLK. So this method is a bit risky.
SkatterBencher reached 4.74 GHz with 104 MHz BCLK in his trials with the Ryzen 7 5800X3D. Overclocking was done on ASUS’ Crosshair VIII Extreme motherboard with custom components from EK’s Quantum liquid cooling series. The user has increased the Ryzen 5800X3D’s limit of 1.35v to 1,375v thanks to the voltage offset series and ASUS’ exclusive Voltage Suspension feature.
Finally, let’s talk about the Voltage Suspension feature. This feature allows the user to set voltages based on specific temperature targets and the CPU to use higher voltages at lower temperatures. It also allows the voltage to be adjusted at higher temperatures to maintain the health of the CPU.