The GPU’s CUDA cores now should calculate BVR, intersection, reflection, and refraction. The GTX 16-series chips have an edge over “Pascal” regardless of missing RT cores, because the “Turing” CUDA cores assist concurrent INT and FP execution, permitting extra work to be performed per clock. NVIDIA in an in depth presentation listed out the sorts of real-time ray-tracing results obtainable by the DXR API, specifically reflections, shadows, superior reflections and shadows, ambient occlusion, international illumination (unbaked), and combos of those. The firm put out detailed efficiency numbers for a choice of GTX 10-series and GTX 16-series GPUs, and in contrast them to RTX 20-series SKUs which have specialised {hardware} for DXR.
Update: Article up to date with extra take a look at information from NVIDIA.
According to NVIDIA’s numbers, GPUs with out RTX are considerably slower than the RTX 20-series. No surprises right here. But at 1440p, the decision NVIDIA selected for these checks, you would wish not less than a GTX 1080 or GTX 1080 Ti for playable frame-rates (above 30 fps). This is very true in case of Battlefield V, wherein solely the GTX 1080 Ti manages 30 fps. The hole between the GTX 1080 Ti and GTX 1080 is huge, with the latter serving up solely 25 fps. The GTX 1070 and GTX 1060 6 GB spit out actually quick Powerpoint displays, at below 20 fps.
It’s necessary to notice right here, that NVIDIA examined on the highest DXR settings for Battlefield V, and reducing the DXR Reflections high quality may enhance frame-rates, though we stay skeptical in regards to the slower SKUs akin to GTX 1070 and GTX 1060 6 GB. The story repeats with Shadow of the Tomb Raider, which makes use of DXR shadows, albeit the frame-rates are marginally increased than Battlefield V. You nonetheless want a GTX 1080 Ti for 34 fps.Atomic Heart makes use of Advanced Reflections (reflections of reflections, and non-planar reflective surfaces). Unfortunately, no GeForce GTX card manages efficiency over 15.four fps. The story repeats with 3DMark Port Royal, which makes use of each Advanced Reflections and DXR Shadows. Single-digit frame-rates for all GTX playing cards. The efficiency is best with Justice tech-demo, though far-from playable, as solely the GTX 1080 and GTX 1080 Ti handle over 20 fps. Advanced Reflections and AO, in case of the Star Wars RTX tech-demo, is one other torture for these GPUs – single-digit frame-rates throughout. Global Illumination with Metro Exodus is one other slog for these chips.Overall, NVIDIA has managed to script the right commercial for the RTX 20-series. Real-time ray-tracing on compute shaders is horrendously gradual, and it pays to have specialised {hardware} akin to RT cores for them, whereas tensor cores speed up DLSS to enhance efficiency even additional.
It stays to be seen if AMD takes a swing at DXR on GCN stream processors any time quickly. The firm has already had a technical effort underway for years below Radeon Rays, and is reportedly engaged on DXR.
Update:
NVIDIA posted its take a look at information for 4K and 1080p along with 1440p, and medium-thru-low settings of DXR. Their complete take a look at information is posted under.
