So this day has come. AMD today unveiled its Radeon RX 6000 graphics cards, which, for the first time in a long time, have brought the company back to the war front among the most powerful graphics cards. Yes, despite rumors that AMD’s top will fight the RTX 3070 at best, the reality is much more interesting.
But first things first. We were presented with three adapters today: Radeon RX 6900 XT, RX 6800 XT and RX 6800. And these are clearly competitors for the RTX 3090, RTX 3080 and RTX 3070, albeit with some nuances.
Let’s take a look at the characteristics.
What can be distinguished? First, there are about half the number of stream processors relative to the number of CUDA cores in Ampere cards. But the Ampere cards received a very unusual architecture, and now you cannot judge the performance by the number of CUDA cores.
Secondly, all new AMD products have 16 GB of memory. In the case of the RX 6900 XT, this is less than that of the Nvidia flagship, but in the case of the RX 6800, on the contrary, the AMD card got twice as much memory as the competitor!
Thirdly, AMD cards do not have the widest bus – only 256 bits. But here comes into play a technology unique to video cards called Infinity Cache. This is a high-performance, last-level data cache suitable, according to AMD’s press release, for high-resolution gaming. Its only 128 MB, but this is supposedly enough to increase the performance of the memory subsystem with its not the highest bandwidth.
And it is not high, because the new Radeon has not only a 256-bit bus, but also GDDR6 memory with a frequency of 16 GHz. As a result, the bandwidth of all new products is 512 GB / s, while even the RTX 3080 reaches 760 GB / s.
Another aspect is very high GPU frequencies. Even the reference cards are claimed to reach 2250 MHz. Real frequencies should be higher, and overclocked ones there, according to rumors, will have about 2500 MHz!
Well, and the last point on the parameters – Ray Accelerators. These are ray tracing hardware accelerated blocks, and there is one for each CU. But there are no details yet, and the first leaks indicate that AMD’s new products are weaker in tracing than Nvidia cards. However, you need to wait for tests in games, but everything is not so simple here, because modern games support RTX tracing, and this is Nvidia’s proprietary technology, although it relies on DirectX12.