AMD Navi 31 GPU: new rumors tease 24GB GDDR6 on 384-bit memory bus

AMD's next-gen RDNA 3 graphics architecture will be led by the new Navi 31 GPU, which has changed specifications according to the very, very latest leaks.

Navi 31 is now reportedly packing a wider 384-bit memory bus, up from the 256-bit memory bus from previous rumors... while also packing 24GB of GDDR6. Navi 31 has been mentioned with a 256-bit memory bus + 32GB GDDR6 before, so this new SKU is interesting.

The newer Navi 31 rumored GPU specs would see the 384-bit memory bus not just increasing overall memory bandwidth over a 256-bit memory bus, but AMD would require fewer memory modules at the same time. This means that AMD and its AIB partners can make their Navi 31-based offerings cheaper, and require less cooling (which also helps with costs).

AMD is also reportedly using 1 x GCD (Graphics Compute Die) joined by 6 x MCD (Memory Compute Dies) inside of the MCM (multi-chip module) design of Navi 31.

• Navi 31 - 384-bit (up from 256-bit)
• Navi 32 - 256-bit (up from 192-bit)
• Navi 33 - 128-bit (hasn't changed)

This is much different than previous rumors, which suggested AMD would be using 2 x Compute Dies. Instead, it appears the MCM design will only affect the memory subsystem (L3 cache + Infinity Cache) while the GPU itself is still monolithic.

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Twitter user "AMDGPU_" posted a mock-up of the Navi 31 package, above.

AMD launched the first PCIe 4.0-based GPU with its RDNA-based Radeon RX 5000 series, and the first PCIe 3.0-based Radeon HD 7000 series GPUs... and now into the warm, huge bandwidth arms of PCIe 5.0 x16 which offers a huge 128GB/sec (up from 64GB/sec on PCIe 4.0 x16 and 32GB/sec on PCIe 3.0 x16).