Tech outlet Angstronomics has published a very detailed summary regarding the specifications of AMD’s RDNA 3 GPUs such as the Navi 31, Navi 32 and Navi 33 chips that will power their next-gen Radeon RX 7000 series graphics cards.
AMD Navi 31, Navi 32, Navi 33 “RDNA 3” GPUs for Radeon RX 7000 Series Graphics Cards Detailed
Previously leaked information within the Linux patches has revealed that at least four RDNA 3 IPs will be launched for the consumer segment. These include Navi 31, Navi 32, Navi 33 and an APU design.
|GC IP VER||GFX ID||AMDGPU_FAMILY (via Coelacanth-Dream)||TYPE|
|11.0.0||gfx1100 (Navi31)||AMDGPU_FAMILY_GC_11_0_0 (FAMILY_GFX1100)||dGPU|
|11.0.2||gfx1102 (Navi32)||AMDGPU_FAMILY_GC_11_0_0 (FAMILY_GFX1100)||dGPU|
|11.0.3?||gfx1101 (Navi33)?||AMDGPU_FAMILY_GC_11_0_0 (FAMILY_GFX1100)?||dGPU?|
Now Angstronomics has reported information such as die size, GPU configurations and features that may end up in the final retail products. An interesting statement has been made from the tech outlet showing that configurations for Navi 3X GPUs were first formulated in 2019 and then finalized sometime in 2020. These specs haven’t changed, but several rumors have pointed to two different specs for the GPUs meaning AMD has in fact made changes since their final designs or those rumors just weren’t in line with the truth. That said, let’s see what kind of configurations we can expect with the Navi 3x “RDNA 3” GPU lineup.
AMD confirmed that its RDNA 3 GPUs will come later this year with a massive performance boost. The company’s senior vice president of engineering, Radeon Technologies Group, David Wang, said the next-gen GPUs for the Radeon RX 7000 series will provide more than 50% performance per watt uplift compared to existing RDNA 2 GPUs. . Some of the key features of the RDNA 3 GPUs highlighted by AMD include:
- 5nm process node
- Advanced chiplet packaging
- Redesigned calculator
- Optimized graphics pipeline
- Next-Gen AMD Infinity Cache
- >50% performance/watt vs. RDNA 2
Gamers can expect smooth 4K gaming to be buttery smooth on these graphics cards, and with the FidelityFX suite bringing next-generation FSR, SAS and SAM support, we could even see playable 60 FPS with 8K resolution.
AMD Navi 31 “Plum Bonito” GPU Configuration
The AMD Navi 31 GPU, the flagship RDNA 3 chip, would power the next generation of enthusiast cards like the Radeon RX 7900 XT graphics card. We’ve heard that AMD will be dropping CU (Compute Units) in favor of WGP (Work Group Processors) on its next-gen RDNA 3 GPUs. Each WGP will contain dual CU (Compute Units), but with twice the SIMD32 clusters instead of just 2 on each CU within RDNA 2. Rumor has it that AMD has the option to choose between Samsung and TSMC for the 6nm die. .
- AMD Navi31: 12288 cores, 384-bit bus, 192 MB Infinity Cache, 308 mm2 GPU Die @5nm
- AMD Navi 21: 5120 cores, 384-bit bus, 128MB Infinity Cache, 520mm2 GPU die @7nm
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 yields a total of 12,288 SPs or stream processors. This is a 2.4x increase in cores compared to the 5120 SPs on the Navi 21 GPU. The GPU or the Navi 31 GCD measures 308 mm2 and is packaged on TSMC’s 5nm process node.
The Navi 31 GPU will also include 6 MCDs with 16 MB Infinity Cache per die and likely 64-bit (32-bit x 2) memory controllers that will power the chip with a 384-bit bus interface. While this equates to 96MB of Infinity Cache, which is lower than the 128MB on current Navi 21 GPUs, there is also a 3D stacked solution in the works that was recently spotted that would double the Infinity Cache by 32 . MB (16 MB 0-hi + 16 MB 1-hi) capacities for a total of 192 MB cache. This is a 50% increase over the current Navi 21 design, and it also makes Navi 31 the first GPU to feature both chiplet and 3D stacked designs. These chiplets or MCDs are fabricated on TSMC’s 6nm process node and measure 37.5mm2 each.
The outlet reports that an even higher 288 MB (16 MB 0-Hi + 16 MB 1-Hi + 16 MB 2-Hi) MCD package was planned, but that was scrapped for cost-benefit reasons. There are also talks of a stripped-down variant of the Navi 31 GPU with 42 WGPs or 10,752 cores and 5 MCDs for 80 MB Infinity Cache over a 320-bit bus interface.
Now this will result in higher power consumption and AMD seems to have confirmed so much that their next generation graphics cards will have higher power consumption but they will still be a more efficient option than what NVIDIA has to offer. The AMD Radeon RX 6950 XT already has a TBP of 335W, so for a >2x performance gain. The cards are expected to retain their dual 8-pin plug-in power supply and feature an updated three-fan cooling design that is slightly larger than the current design.
AMD Navi 32 “Wheat Nas” GPU Configuration
The AMD Navi 32 GPU codenamed “Wheat Nas” is also one of two MCM GPUs in the RDNA 3 series. The GPU will contain a single GCD (Graphics Compute Dies) and four MCDs (Multi-Cache Die). The GPU or GCD would be 200mm . to measure2 while each MCD maintains the same size at 37.5mm2.
- AMD Navi32: 7680 Cores, 256-bit bus, 64MB Infinity Cache, 200mm2 GPU Die @5nm
- AMD Navi22: 2560 cores, 192-bit bus, 96 MB Infinity Cache, 335 mm2 GPU Die @7nm
The GCD will be equipped with 3 Shader Engines and each Shader Engine will have 6 Shader Arrays (18 in total). The GPU will contain a total of 30 WGP or 60 Compute Units for a total of 7680 cores. This rounds up to >50% more cores than the flagship Navi 31.
Each MCD must also have 2 memory link links (32-bit). That’s a total of 8 32-bit memory controllers for a 256-bit bus interface. Each MCD will retain the 16MB of 0-Hi capacity, but there doesn’t seem to be a 1-Hi variant, meaning the chip will only have 64MB of maximum configurations. That Navi 32 GPU is said to be launched in 2023 and will be the highest-end chip for mobile and mid-tier chip for desktops. The GPU would roll out to the mobile segment for the first time and could be announced at CES 2023, which is ideal given that we’ll have Phoenix Range and Dragon Range laptops with Zen 4 cores ready by then.
AMD Navi 32 “Hotpink Bonefish” GPU Configuration
The AMD Navi 33 GPU codenamed “Hotpink Bonefish” will launch the monolithic segment within the RDNA 3 family. The GPU will contain a single die. The die is very similar to the flagship Navi 21 GPU and is expected to use a 6nm process node for fabrication with a die size of 203mm2.
- AMD Navi33: 4096 cores, 128-bit bus, 32MB Infinity Cache, 335mm2 GPU die @6nm
- AMD Navi23: 2048 cores, 128-bit bus, 32 MB Infinity Cache, 237 mm2 GPU Die @7nm
The Navi 33 GCD is expected to have 2 Shader Engines and each Shader Engine will have 2 Shader Arrays (2 per SE/4 in total). This rounds up to 16 WGPs or 32 compute units for a total of 4096 cores, which is higher than the Radeon RX 6800 “Navi 21 XL” GPU. The GPU comes with 32MB Infinity Cache, the same number as the Navi 23 GPU, and over a 128-bit wide bus. Like the Navi 32 GPUs, the Navi 33 chips will target the early graphics performance mobile lineup first, giving them an edge over the Intel Arc Alchemist lineup at less than half the cost and while using less power.
The outlet also talks about two new features for AMD RDNA 3 Navi 3x GPUs for Radeon RX 7000 series graphics cards, such as:
One of the features in the RDNA 3 graphics pipeline is OREO: Opaque Random Export Order, which is just one of many techniques to save space. With gfx10, the pixel shaders work out of order, with the outputs going into a reorder buffer before going in sequence to the rest of the pipeline. With OREO, the next step (blend) can now receive and execute edits in any order and export in order to the next stage. For example, the ROB can be replaced by a much smaller skid buffer, saving space.
The Memory Attached Last Level (MALL) cache blocks are each halved, doubling the number of banks for the same cache amount. There are also changes and additions that increase the graphics to MALL bandwidth and reduce the penalty of going to VRAM.
The AMD Radeon RX 7000 “RDNA 3” GPU lineup based on the Nav 3x GPUs is expected to launch later this year with reports of the flagship Navi 31 launching first, followed by Navi 32 and Navi 33 GPUs.
AMD RDNA 3 Navi 3X GPU Configurations (for now)
|GPU Name||Navi 21||Navigation 33||Navi 32||Navigation 31||Navi 3X|
|GPU package||monolithic||monolithic||MCM (1 GCD + 4 MCD)||MCM (1 GCD + 6 MCD)||MCM (NBD)|
|GPU die size:||520mm2||~400mm2||440mm2||630mm2||To be determined|
|SPs per WGP||128||256||256||256||256|
|Units of Account (per die)||80||40-32||160 -128 (total)||240-192 (total)||128 (per GPU)
|Cores (per die)||5120||5120-4096||10240-8192||15360-12288||8192|
|Memory bus||256-bit||128 bit||256-bit||384-bit||384 bit x2?|
|Memory capacity||Up to 16GB||Up to 8GB||Up to 16GB||Up to 24GB||Up to 32GB|
|Memory Speed||16-18 Gbps||To be determined||To be determined||20 Gbps||To be determined|
|Memory bandwidth||512-576GB/s||To be determined||To be determined||960GB/s||To be determined|
|Infinite cache||128MB||128MB||256MB||384 MB||To be determined|
|Flagship SKU||Radeon RX 6900 XTX||Radeon RX 7600XT?||Radeon RX 7800XT?
Radeon RX 7700XT?
|Radeon RX 7900XT?||Radeon Pro|
|TBP||330W||~200W||~300W||~400W||To be determined|
|launch||4th quarter 2020||Q4 2022?||Q4 2022?||Q4 2022?||2023?|
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