Digital Foundry released a video comparing the ray tracing performance of the RTX 2080 Ti to the RTX 3080. I know some are disappointed in Ampere's jump in ray tracing performance thinking they would get little to no hit at all with ray tracing on but the jump is still impressive. They leave some interesting info at 6:58. At 4K Native/Extreme settings/Ultra RT in Metro Exodus the RTX 3080 is 50% faster. At 4K Native/High settings/ High RT the RTX 3080 is 45% faster. But DLSS appears to be the equalizer that closes the performance gap with 4K DLSS/Ultra Settings/Ultra RT being 30% faster and 4K DLSS/High Settings/High RT being 37% faster on the RTX 3080. This is with DLSS 1.0 so who knows what it would be like with 2.0 and above. In Control the RTX 3080 was able to easily outperform the 2080 Ti despite the 2080 Ti using lower settings and the 3080 having everything maxed out.
TLDR: The higher the resolution and settings, the bigger the difference in performance between the RTX 3080 and 2080 Ti.
The Boundary benchmark is amazing and what makes it even possible to run at 4k 30-40fps on the 3080 is DLSS. DLSS is certainly a big game changer in how hard developers can push graphics on PC. AMD better have their own alternative or otherwise Nvidia cards will be running laps around them.
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