One of the key features of the RDNA 2 graphics microarchitecture used in AMD Radeon RX 6000 graphics cards is support for hardware accelerated ray tracing. At the presentation, AMD modestly kept silent about the performance of its new ray-traced cards, after which logical assumptions immediately appeared that the “red” has nothing to brag about in this matter. And now these fears have been confirmed.
By analogy with opponents in the face of NVIDIA GeForce RTX 3000, the GPU Navi 21 configuration, on which the first Radeon RX 6000 cards are based, includes special blocks called Ray Accelerators (RA) by the manufacturer. There are exactly the same number of “ordinary” computing units CU – 80 (RX 6900 XT), 72 (RX 6800 XT) and 60 (RX 6800) pieces.
Actually AMD pointed out performance data for Ray Accelerators – small print in footnotes on the RDNA 2 architecture page. AMD staff used the Procedural Geometry tool from the Microsoft DXR SDK to evaluate performance in their own tests. AMD indicates the result of 471 fps, without specifying which model it belongs to (most likely, this is the result of the RX 6800 XT).
Thus, the Radeon RX 6000 noticeably outperforms RTX 2000 in ray tracing performance – the first generation of NVIDIA cards with support for ray tracing (GeForce RTX 2080 and GeForce RTX 2080 Ti indicators – 308 and 390 fps). At the same time, they are far behind the current RTX 3000 cards of the Ampere family. For comparison, the RTX 3080, with which the RX 6800 XT will compete, produces 630 fps in the Procedural Geometry test, and the flagship RTX 3090 – even 749 fps.
If we assume that the result belongs to the RX 6800 XT, then it turns out that the “red” adapter is 33% behind its “green” opponent. In other words, the Radeon RX 6000 is a third slower than the RTX 3000 in ray tracing.
Of course, these are only the first tests, and it will be possible to fully assess the performance of the new Radeon cards after the release of independent reviews, but it is already clear that in ray tracing they are inferior to competing RTX 3000 models. how the cards will eventually show themselves in games.