Leaked AMD Navi 31 GPU diagram confirming a PCI Express 4.0 bus

Last Thursday AMD presented its latest RDNA 3 graphics architecture that brings AMD Radeon RX 7000 Series graphics cards to life. In this first presentation we have seen the most powerful models AMD Radeon RX 7900 XT and RX 7900 XTXboth based on the GPU Navi 31. To know more details of this GPU that the top of the range carry, from Videocardz we see the diagram what have the Navi 31 along with some more information from this first chiplet-based GPU.

With this filtered slide of the Navi 31 diagram, a PCI Express 4 x16 bus for this new generation of graphics cards, just like the new NVIDIA RTX 40 Series. It also details the design of the TSMC-manufactured 5nm GCD graphics chip. This graphics chip has 6 Shader Engines where each one has 8 dual compute units for a total of 6.144 Stream Processor. Although it has 8 computing units, these being dual offer up to 61.6 TFLOPs/swhich is 2.7 times more than the previous generation, obtaining a up to 1.54 times more performance per watt.

Surrounding the GCD are 6 CDM manufactured at 6 nanometers. These MCDs have 16 MB Infinity Cache each (or L3 Cache), offering a total of 96 MB. They also feature a 64-bit GDDR6 memory interface for a total bus of 384 bits and a speed of up to 960 Gbps thanks to its 20 Gbps memory. It also shows us that L0 and L1 cache is 3 MB and L2 is 6 MBwith a significant increase compared to RDNA 2.

Along with this new generation based on RDNA 3 also added 2nd generation Raytracing and speeds that reach 2.5 GHz, but with a design prepared to reach 3 GHz. Other novelties that have been included are AV1 compatible dual encoding and decoding engines up to 8K at 60 FPs, new DisplayPort 2.1 connector for higher refresh rates at higher resolutions and compatible with the new AMD FSR 3.

The new AMD Radeon RX 7900 XT and RX 7900 XTX will be available next December 13, date on which they can be purchased by users and thus test the performance that looks so good on paper. For now it is not known if AMD will release the reviews before this date to find out how well these new RDNA 3 cards perform.

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