AMD RDNA 3 Flagship, Navi 31 GPU rumored to offer up to 384-bit bus and 24 GB of GDDR6 memory, Navi 32 gets 256-bit for up to 16 GB of memory

AMD RDNA 3-powered Navi 3x GPUs are now rumored to feature an updated memory layout with the flagship offering the same VRAM as the NVIDIA RTX 4090 graphics card.

AMD RDNA 3 main GPUs get an upgraded memory configuration: The Navi 31 is now rumored to use a 384-bit bus with up to 24GB of memory, and the Navi 32 is getting a 256-bit bus with up to 16GB of memory

The rumors are straightforward and come again from Grimon 55. There have been recent reports from RedGamingTech That AMD’s flagship Navi 31 GPU will be equipped with a larger 384-bit bus interface compared to the previously speculated 256-bit that was valid but only when previous specs are talked about. The updated specification appears to have lowered the core count but increased the overall memory layout that flagship RDNA 3 GPUs have to offer.

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AMD RDNA 3 Navi 31 GPUs for Radeon RX 7900 . Series

AMD Navi 31 . GPUThe groundbreaking RDNA 3 chip will power next-generation enthusiast cards like the Radeon RX 7900 XT graphics card. We’ve heard that AMD will drop CUs (computing units) in favor of WGP (working set processors) in the next generation of RDNA 3 GPUs. Each WGP will contain double CUs (computational units) but with twice the SIMD32 combinations versus only 2 in each CU within RDNA 2. Rumors are that AMD has the option to choose between Samsung and TSMC for the 6nm die.

According to the latest information, the AMD Navi 31 GPU with RDNA 3 architecture is expected to offer a single GCD with 48 WGPs, 12 SAs and 6 SEs. This will give a total of 12,288 stream processors which is less than the previous count. This will also lower overall computing performance unless AMD is going crazy with more than 3.0 GHz clock in the core. The Navi 31 GPU will also carry 6 MCDs which will have a 64MB Infinity cache per die, and possibly also 64-bit (32-bit x 2) memory controllers that will supply the chip with a 384-bit bus interface.

Navi 31 (RDNA 3) MCDs will be linked to a single GCD via next-generation interconnected Infinity Fabric and feature a 256-384MB Infinity cache. Given the latest memory design, the next generation Navi 31 GPUs can be equipped with up to 24GB of VRAM, the same memory capacity as The upcoming and current flagship from NVIDIA (RTX 3090 / RTX 4090). The newer memory specification can be seen as a downgrade over the previously rumored 32GB memory, but it will certainly help lower card prices and parity with NVIDIA while running Infinity Cache can deliver competitive performance at higher gaming resolutions.

AMD RDNA 3 Navi 32 GPUs for Radeon RX 7800 Series

The AMD Navi 32 GPU is also one of two MCM GPUs in the RDNA 3 lineup. The GPU will contain one GCD (graphics compute templates) and four MCDs (multi-cache template). The template is very similar to the flagship Navi 31 GPU but has a lower Shader Engine in each template. The AMD Navi 32 GCD is expected to use TSMC’s 5nm process node while the MCD will be based on 6nm process node.

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The GCD will be equipped with 4 Shader Engines and each Shader Engine has 2 Shader Arrays (4 in total). Each Shader array consists of 4 WGPs (8 per SE/32 in total) and each WGP comprises 8 SIMD32 units with 32 ALUs (32 SIMD32 per SA/64 each SE/128 in total). These SIMD32 modules combine to form a total of 8,192 cores.

Navi 32 (RDNA 3) MCDs will be linked to GCD via the next generation of interconnected Infinity Fabric and feature a rumored 256MB of Infinity cache. Each MCD must also have two memory connection links (32-bit). This is a total of 8 32-bit memory controllers for a 256-bit bus interface. The graphics chip should provide up to 16GB of GDDR6 memory, the same amount as current Navi 21 GPUs but 33% higher memory capacity than Navi 22 GPUs.

This will raise the performance of the AMD Radeon RX 7700 series above the RX 6800 and RX 6900 series, providing a huge leap in graphics power in games. This will also push the power numbers up as the RX 6700 XT is currently rated at 230W but can go as high as 270-300W.

There have been many rumors that the upcoming RDNA 3 GPUs will outperform everything NVIDIA has to offer in terms of rasterization performance and power efficiency. It looks like AMD will take the lead by introducing the first MCM-based GPUs in the Radeon RX 7000 lineup.

There is, too Rumors About 3D stacking on the flagship GPU Navi 31 and currently expected to be released in the second half of 2022.

AMD RDNA 3 Navi 3X GPU Configurations (Initial)

GPU name Navi 21 Navi 33 Navi 32 Navi 31
GPU operation 7 nm 6 nm 5 nm / 6 nm 5 nm / 6 nm
GPU Package congener congener million cubic meters million cubic meters
Shader Engines 4 2 4 6
GPU WGPs 40 16-20 40-32 60-48
SP per WGP 128 256 256 256
Calculation units (per template) 80 40-32 160-128 (total) 240-192 (total)
cores (per die) 5120 5120-4096 5120-4096 7689-6144
cores (total) 5120 5120 10240-8192 15360-12288
Memory bus 256 bit 128 bit 256 bit 384 bit
memory type GDDR6 GDDR6 GDDR6 GDDR6
Memory capacity up to 16 GB up to 8 GB up to 16 GB up to 24 GB
infinity cache 128 MB 128-256 MB 384 MB 512MB
Major SKU Radeon RX 6900 XTX Radeon RX 7700 XT? Radeon RX 7800 XT? Radeon RX 7900 XT?
TBP 330 W ~200 watts ~ 300 watts ~ 400 watts
launch Fourth Quarter 2020 Fourth quarter 2022? Fourth quarter 2022? Fourth quarter 2022?

What next generation GPUs are you most looking forward to?

news source: 3DCenter

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