Reasonably reliable leaker Patrick Schur tweeted a series of specs for Navi 21 XT, aka Big Navi, which said the graphics card will have 16GB of GDDR6 video memory and a 2.4 GHz “Game Clock.” That’s presumably the clock speed of the GPU when running games, rather than the base clock speed or maximum speed.
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Comparatively, the GeForce RTX 3080 has 10GB of faster GDDR6 VRAM, but only clocks to 1.71 GHz. Depending on the interplay between clock speed and memory speed and bandwidth, the Radeon RZ 6900 XT might have the scope to take down the mighty $699 Nvidia graphics card.
A clock speed of 2.4 GHz is also the fastest speed a consumer-grade graphics card has ever got to, meaning AMD could set a new benchmark in that case. Speaking of benchmarks, the ones we’ve seen lead so far have Big Navi tipped as nipping at the heels of the RTX 3080.
Navi 21 XT16GB GDDR6255W TGP~2.4 GHz (Game Clock)October 17, 2020
However, the Radeon RX 6000 series, due to be revealed October 28, is set to be made up of multiple graphics cards. So that means the leaked benchmarks so far might not be for Big Navi, which we’re taking to be the most powerful next-generation GPU AMD will be able to bring to bear in the graphics card arena.
Big Navi, and indeed the rest of the Radeon RX 6000 graphics cards, will use the new RDNA 2 GPU architecture, which can also be found in the PS5 and Xbox Series X. We know those consoles will support ray-tracing, but we’re not sure exactly how. That suggests that the upcoming Radeon graphics cards will support ray-tracing, but whether they have dedicated hardware to do so like Nvidia's latest GeForce RTX 3000-series has yet to be made clear.
All is likely to be revealed next week at a big AMD Radeon showcase. We’re hoping to see a suite of powerful graphics cards that can challenge Nvidia's latest high-end GPUs but also potentially undercut them on price, injecting some serious competition into the market.