With GeForce GTX 1060 6GB and higher graphics cards expected to be able to enable RTX specific effects, like real-time DXR global illumination in Metro Exodus
as well as the ray-traced reflections in Battlefield V as part of a new Game Ready Driver coming in April. This is great news for PC gamers, as it will effectively open up the previous high-end RTX-only effects to a huge market.
Of course the results will mean lower performance without the dedicated RTX cores found in GPUs like the NVIDIA GeForce RTX 2080 Ti
and RTX 2060
. As the following technical explanation covers.
RT Cores on GeForce RTX GPUs provide dedicated hardware to accelerate BVH and ray / triangle intersection calculations, dramatically accelerating ray tracing. On GeForce GTX hardware, these calculations are performed on the shader cores, a resource shared with many other graphics functions of the GPU.
Which is as expected as ray-tracing or DXR as found in DirectX is not limited to hardware, but a technique that simply requires a lot of processing grunt to properly render. Interestingly the new Turing based GTX cards, the 1660 Ti and the new 1660, offer advantages over the older Pascal models.
On Pascal-architecture GPUs we see that ray tracing and all other graphics rendering tasks are handled by FP32 Pascal shader cores. This takes longer to perform, translating to a lower FPS. The Turing architecture introduced INT32 Cores that operate simultaneously alongside FP32 Cores.
Very cool. The following admittedly internal benchmarks show the performance difference at 1440p with Ultra-level ray-tracing - so it's expected that older GTX cards (including the GTX 1080) would need to set ray-tracing detail settings to low.
With NVIDIA clearly focused on implementing next-gen effects like real-time ray tracing right now, wider support could lead to more adoption by games.