AMD's RDNA 3 RX 7900 XT reportedly packs 20GB of memory and isn't Radeon's next-gen flagship

AMD's RX 7950X will be even more powerful

AMD's RDNA 3 RX 7900 XT reportedly packs 20GB of memory and isn't Radeon's next-gen flagship

Rumour has it AMD is confident that their RX 7900 XT can best Nvidia's RTX 4090, and that GPU isn't AMD's flagship!

AMD's set to launch their RDNA 3 graphics architecture on November 3rd with the reveal of their Radeon RX 7000 series of graphics cards. These GPUs will be the first AMD graphics cards to utilise 5nm lithography, a chiplet-based design, and the company's re-architected RDNA 3 compute units. 

With RDNA 3, AMD is expected to deliver a major performance/watt leap over today's RDNA 2 graphics chips, with AMD promising a 50+% uplift. Rumour has it that their planned Radeon RX 7900 XT graphics card will feature 20GB of GDDR6 memory and be a competitor to Nvidia's RTX 4090. Even better is reports that AMD's RX 7900 XT isn't their RDNA 3 flagship, which means that AMD could have a proper Nvidia-beater on their hands. 

According to WCCFTECH AMD's Radeon RX 7900 XT features 20GB of GDDR6 memory over a 320-bit memory bus. This gives AMD's RX 7900 XT a 25% increase in memory bus size over the company's current-generation RX 6900 XT, giving it a 25% memory bandwidth increased when discounting changes to memory speeds. AMD is expected to utilise faster GDDR6 memory modules with their Radeon RX 7000 series GPUs, so greater than 25% increases to raw memory bandwidth are expected (discounting the impact of AMD's Infinity Cache). AMD's RX 7900 XT reportedly features AMD's Navi 31 silicon, though not the full chip.   

AMD's RDNA 3 flagship, what's likely to be called the RX 7950 XT, reportedly features a 384-bit memory bus and 24GB of GDDR6 memory. This graphics card would have a memory bus that is 50% wider than AMD's Radeon RX 6900 XT. This GPU is reportedly AMD's answer to Nvidia's RTX 4090 Ti graphics card, a GPU that features the full potential of their Ada graphics architecture.

AMD's RDNA 3 RX 7900 XT reportedly packs 20GB of memory and isn't Radeon's next-gen flagship

AMD's Navi 31 silicon is reportedly made up of a single GPU compute die and six memory controller dies. If the above specifications for AMD's Radeon RX 7900 XT and RX 7950 XT graphics cards are legitimate, each of these memory dies from AMD will connect to 4GB of GDDR6 memory and act as a 64-bit portion of each GPU's memory bus. AMD's RX 7900 XT will have five active memory controller dies, while AMD's RX 7950 XT will have six active memory controller dies. 

Previous rumours have suggested that AMD's memory dies will all feature a segment of Infinity Cache, with AMD's Navi 31 silicon reportedly featuring 96MB of "Next-Gen AMD Infinity Cache". With 3D die stacking, this Infinity Cache can reportedly be doubled, giving the chip 192MB of Infinity Cache. If AMD's RX 7900 XT does have a disabled memory controller die, that die's Infinity Cache will be disabled, giving the chip 80MB of Infinity Cache (or 160GB if doubled through 3D die stacking).

If today's rumours are correct, AMD's very confident about their RDNA 3 graphics architecture. Huge gains in rasterisation performance are expected over their Radeon RX 6000 series GPUs, and AMD's re-architected compute units and other architectural changes are expected to have a major impact on AMD's ray tracing performance. How RDNA 3 compares with Nvidia's RTX 40 series remains unclear, but if RDNA 3 is as impressive as it sounds, AMD is onto a winner. That said, we doubt AMD will have an answer to DLSS 3 anytime soon.

You can join the discussion on AMD's Radeon RX 7900 XT graphics card on the OC3D Forums.

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Most Recent Comments

24-10-2022, 15:33:04

hmm.... I am thinking 7950, 7970, 7990.

Although they had those back a decade or so ago I believe.Quote

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