Stochastic Screen Space Reflections (SSSR)
The Vulkan version of the sample has a known TDR when used on AMD GPUs with the Radeon Software Adrenalin 2020 Edition 20.12.1 driver. If you hit that issue, please go back to Radeon Software Adrenalin 2020 Edition 20.11.3 which is unaffected, ahead of the next release of FidelityFX SSSR which will fix it.
FidelityFX Stochastic Screen Space Reflections (SSSR) provides an RDNA-optimized solution for screen space reflections.