De-lidded AMD Ryzen 7 5800X3D Has Vastly Improved Thermals

An AMD Ryzen 7 5800X3D processor that’s been de-lidded (has its integrated heatspreader or IHS removed), posts vastly better thermals, according to Madness7771 on Twitter, who succeeded in de-lidding their 5800X3D. The stock 5800X3D posts significantly higher CPU core temperatures than a regular 5800X, due to its 3D Vertical Cache (3DV Cache) chiplet design, in which heat from the CPU cores is conducted through structural silicon, to the surface of the die-stack, from where the STIM conducts heat onward to the IHS.

A de-lidded 5800X3D reveals the 8-core “Zen 3” 3DV chiplet (CCD) next to a blob of structural material in the vacant area meant for a second CCD. With the residual STIM cleaned off, Madness7771 used a Conductonaut TIM and a Noctua NH-D14 to cool the processor. Madness7771 also posted some before and after temperature numbers for the processor (using the same cooler). It sees a maximum temperature drop from 80 °C to 70 °C, and average temperature drop from 78 °C to 67 °C, tested with a Forza Horizon 5 gaming workload. They also note that the peak temperature of the 5800X3D no longer reaches over 90 °C. De-lidding processors with STIM is a very risky process, and will destroy your processor if not done right.