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AMD Ray Accelerator taber til NVIDIA RT Core

AMD var ikke ivrig efter at dele detaljer om Ray tracing-ydelsen i sin Radeon RX 6000-serie ved lanceringen, men efterfølgende, har producenten afsløret nogle flere detaljer, der kan sammenlignes direkte med NVIDIA Ampere-serien.

AMD Radeon RX 6000-serien har Ray Accelerators. Hver compute unite har en accelerator:

Disse enheder er ansvarlige for hardwareacceleration af Ray tracing i spil. RX 6900XT har 80 RA'er, RX 6800XT har 72, og RX 6800 har 60. De samme Ray Accelerators kan findes i RDNA2-baserede spilkonsoller.

Radeon RX 6800XT har 72 RA'er, mens GeForce RTX 3080 har 68 RT-kerner. AMD har udført tests ved hjælp af Microsoft DXR SDK-værktøj kaldet "Procedural Geometry".

AMD:

"Measured by AMD engineering labs 8/17/2020 on an AMD RDNA 2 based graphics card, using the Procedural Geometry sample application from Microsoft’s DXR SDK, the AMD RDNA 2 based graphics card gets up to 13.8x speedup (471 FPS) using HW based raytracing vs using the Software DXR fallback layer (34 FPS) at the same clocks. Performance may vary. RX-571!.

Redditor NegativeXyzen testede ASUS RTX 3080 TUF-ydeevne og rapporterede et gennemsnitligt billede på 630:

NVIDIA GeForce RTX 3080 DXR performance, CapFrameX,  i7-8700K @ 5.0 GHz, DDR4-3200

"We have also ran the benchmark on the GeForce RTX 3080 with stock clock and power targets using a precompiled executable file. The RTX 3080 scored 635 framerate on average from three 1 minute runs.

This means that GeForce RTX 3080 is around 33% faster than Radeon RX 6800 XT in this particular benchmark. OF course, there are few things that need to be taken into the account such as the testing platform and DXR benchmark resolution (AMD did not clarify, hence we used default)".

GeForce RTX 3090 har en framerate på 749, ifølge screenshots indsendt af Hassan Mujtaba (Wccftech). Dette betyder, at RTX 3090 er 59% hurtigere end AMD RX 6800XT i denne DXR-test.

NVIDIA GeForce RTX 3090 DXR performance, Source: Hassan Mujtaba (Wccftech)

Source & Image credit:

 AMD (footnotes), Microsoft DX12 Graphics Samples, Precomplied EXE