AMD RDNA 3 Navi 3x GPU illustration showing possible chip configurations.  (Image credit: Olrak_29)

AMD RDNA 3 GPU for Radeon RX 7000 Graphics Details

Technology outlet Angstronomics has released a very detailed roundup of the specs of AMD’s RDNA 3 GPUs, such as the Navi 31, Navi 32 and Navi 33 chips that will continue to power its next-generation Radeon RX 7000 series graphics cards.

AMD Navi 31, Navi 32, Navi 33 “RDNA 3” GPUs for Radeon RX 7000 Series Graphics Cards Details

Previously leaked information in the Linux patch revealed that at least four RDNA 3 IPs will be launched targeting the consumer segment. These include Navi 31, Navi 32, Navi 33 and APU designs.

GC IP version GFX ID AMDGPU_FAMILY (via Coelacanth-Dream) type
11.0.0 gfx1100 (Navi31) AMDGPU_FAMILY_GC_11_0_0 (FAMILY_GFX1100) Discrete graphics card
11.0.1 gfx1103 AMDGPU_FAMILY_GC_11_0_2 (FAMILY_GFX1103) auxiliary power unit
11.0.2 gfx1102 (Navi32) AMDGPU_FAMILY_GC_11_0_0 (FAMILY_GFX1100) Discrete graphics card
11.0.3? gfx1101 (Navi33)? AMDGPU_FAMILY_GC_11_0_0 (FAMILY_GFX1100)? Graphics card?

Now, Angstronomics has reported information such as die size, GPU configuration and features that may end up in final retail products. Tech Outlet made an interesting announcement, which shows that the configuration of the Navi 3X GPU was initially worked out in 2019 and then finalized sometime in 2020. Those specs haven’t changed as various rumors point to two different specs for the GPU which means AMD has actually changed since the final design, or the rumors simply don’t match the truth. With that said, let’s see what kind of configuration you can expect from the Navi 3x “RDNA 3” GPU lineup.

AMD RDNA 3 Navi 3x GPU illustration showing possible chip configurations. (Image credit: Olrak_29)

AMD has confirmed that its RDNA 3 GPUs will launch later this year with a massive performance boost. The next-generation GPUs in the Radeon RX 7000 series will provide more than 50 percent performance-per-watt improvement over existing RDNA 2 GPUs, said David Wang, senior vice president of engineering at the company’s Radeon Technologies Group. Some of the key features of the RDNA 3 GPUs that AMD highlighted include:

  • 5nm process node
  • Advanced Chiplet Packaging
  • Re-architected computing unit
  • Optimized graphics pipeline
  • Next Generation AMD Infinite Cache
  • >50% Perf/Watt vs RDNA 2

Gamers should expect smooth 4K gaming on these cards, and with the FidelityFX suite offering next-gen FSR, SAS and SAM support, we might even see playable 60 FPS at 8K resolution.

AMD Navi 31 “Plum Bonito” GPU Configuration

The AMD Navi 31 GPU is the flagship RDNA 3 chip that will power the next generation of enthusiast graphics cards like the Radeon RX 7900 XT graphics card. We’ve heard that AMD will be ditching CUs (Compute Units) in favor of WGPs (Workgroup Processors) on its next-gen RDNA 3 GPUs. Each WGP will accommodate dual CUs (compute units), but there are twice as many SIMD32 clusters as there are on each CU in RDNA 2, while SIMD32 clusters only have 2. Rumor has it that AMD could choose between Samsung and TSMC for 6nm chips.

  • AMD Navigator 31: 12288 cores, 384-bit bus, 192 MB infinite cache, 308mm2 GPU chip @5nm
  • AMD Navigator 21: 5120 cores, 384-bit bus, 128 MB unlimited cache, 520mm2 GPU chip@7nm

According to the latest news, AMD Navi 31 GPU with RDNA 3 architecture is expected to offer a single GCD with 48 WGP, 12 SA and 6 SE. This will provide a total of 12,288 SPs or stream processors. Compared to the 5120 SP on the Navi 21 GPU, the number of cores has increased by 2.4 times.The GPU or Navi 31 GCD is said to be 308mm in size2 It will be packaged on TSMC’s 5nm process node.

The Navi 31 GPU will also feature 6 MCDs with 16 MB Infinity Cache per chip, and possibly a 64-bit (32-bit x 2) memory controller to provide a 384-bit bus interface to the chip. While this equals 96 MB of Infinity Cache, down from 128 MB on current Navi 21 GPUs, a 3D-Stacked solution was also recently pointed out, which would double the Infinity Cache to 32 MB (16 MB 0-hi + 16 MB 1-hi) capacity for a total of 192 MB cache. This is a 50% increase over the current Navi 21 design, which also makes the Navi 31 the first GPU to feature both a chiplet and a 3D stack design. These chiplets, or MCDs, will be fabricated on TSMC’s 6nm process node and will measure 37.5mm2 each.

The outlet reported that a higher 288 MB (16 MB 0-Hi + 16 MB 1-Hi + 16 MB 2-Hi) MCD package was planned, but was canceled for cost-benefit reasons. There is also talk of a stripped-down variant of the Navi 31 GPU, which will have 42 WGP or 10,752 cores and 5 MCDs for an 80MB Infinity Cache interfaced across a 320-bit bus.

Now, this will lead to higher power consumption, which AMD seems to have confirmed, that their next-gen graphics card lineup will have higher power consumption, but they are still a more efficient option than what NVIDIA offers. The TBP of the AMD Radeon RX 6950 XT has reached 335W, so the performance has been improved by more than 2 times. The cards are expected to retain their dual 8-pin header input power and feature an updated triple-fan cooling design that’s slightly taller than what’s currently in use.

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 be equipped with one GCD (Graphics Computation Chip) and four MCDs (Multi-Cache Chip). GPU or GCD is said to be 200mm in size2 While each MCD will remain the same size of 37.5mm2.

  • AMD Navigator 32: 7680 cores, 256-bit bus, 64 MB infinite cache, 200mm2 GPU chip @5nm
  • AMD Navigator 22: 2560 cores, 192-bit bus, 96 MB unlimited cache, 335mm2 GPU chip @7nm

GCD will be equipped with 3 Shader Engines, each Shader Engine has 6 Shader Arrays (18 in total). The GPU will be equipped with 30 WGPs or 60 compute units for a total of 7680 cores. That’s more than 50% more cores than the Navi 31 flagship.

Each MCD should also have 2 memory connection links (32-bit). A 256-bit bus interface has a total of eight 32-bit memory controllers. Each MCD will reserve 16 MB of 0-Hi capacity, but there doesn’t appear to be any 1-Hi variant, which means the chip will only have a 64 MB max configuration. The Navi 32 GPU is said to launch in 2023 and will be the top of the line for mobile and desktop mid-range chips. The GPU will be first introduced to the mobile space and will likely be announced at CES 2023, which makes perfect sense as we’ll have our Phoenix Range and Dragon Range laptops ready with Zen 4 cores by then.

AMD Navi 32 “Hotpink Bonefish” GPU configuration

The AMD Navi 33 GPU, codenamed “Hotpink Bonefish,” will launch the microcontroller part of the RDNA 3 series. The GPU will be on a single chip. The chip is very similar to the flagship Navi 21 GPU and is expected to be manufactured using the 6nm process node, with a die size of 203mm2.

  • AMD Navigator 33: 4096 cores, 128-bit bus, 32 MB infinite cache, 335mm2 GPU chip @6nm
  • AMD Navigator 23: 2048 cores, 128-bit bus, 32 MB infinite cache, 237mm2 GPU chip @7nm

Navi 33 GCD is expected to have 2 shader engines with 2 shader arrays per shader engine (2 per SE / 4 total). This rounds up to 16 WGP or 32 compute units for a total of 4096 cores, which is higher than the Radeon RX 6800 “Navi 21 XL” GPU. The GPU will feature 32 MB of Infinity Cache, the same amount as the Navi 23 GPU, and span a 128-bit wide bus. Just like the Navi 32 GPU, the Navi 33 chip will focus first on the mobile line, with early graphics performance putting it ahead of Intel’s Arc Alchemist line at less than half the cost and lower power consumption.

The exit also talks about two new features of AMD RDNA 3 Navi 3x GPUs for Radeon RX 7000 series graphics cards, such as:

A feature in the RDNA 3 graphics pipeline is OREO: Opaque Random Export Order, which is just one of many space-saving techniques. With gfx10, the pixel shader runs out of order, where the output goes into the reorder buffer and then moves to the rest of the pipeline in order. With OREO, the next step (blending) can now receive and execute operations in any order, and export to the next stage in sequence. Therefore, the ROB can be replaced with a smaller slide bumper, saving area.

The additional last level (MALL) cache blocks are each halved in size, and the number of banks for the same amount of cache is doubled. There are also changes and additions that increase MALL’s graphics bandwidth and reduce the penalty for using VRAM.

by Angstronomics

The AMD Radeon RX 7000 “RDNA 3” GPU lineup based on Nav 3x GPUs is expected to launch later this year, with reports that the flagship Navi 31 will launch first, followed by the Navi 32 and Navi 33 GPUs.

AMD RDNA 3 Navi 3X GPU Configuration (Preliminary)

GPU name Navigation 21 Navigation 33 Navigation 32 Navigation 31 Navigate 3X
code name Sienna Cichlid pink bony fish Mai Nas Plum bonito pending
GPU process 7nm 6nm 5nm/6nm 5nm/6nm 5nm/6nm
GPU package Monolithic Monolithic MCM (1 GCD + 4 MCD) MCM (1 GCD + 6 MCD) MCM (to be determined)
GPU chip size 520mm2 203mm2 (GCD only) 200mm2 (GCD only)
425mm2 (with MCD)
308mm2 (GCD only)
533mm2 (with MCD)
shader engine 4 2 4 6 8
GPU WGP 40 16 30 48 64
SP per WGP 128 256 256 256 256
Compute unit (per chip) 80 32 60 96 128 (per GPU)
256 (total)
core (per chip) 5120 4096 7680 12288 8192
core (total) 5120 4096 7680 12288 16,384
memory bus 256 bit 128 bits 256 bit 384 bit 384-bit x2?
memory type GDDR6 GDDR6 GDDR6 GDDR6 GDDR6
Memory Capacity up to 16 GB up to 8 GB up to 16 GB up to 24 GB up to 32 GB
memory speed 16-18Gbps pending pending 20Gbps pending
memory bandwidth 512-576 GB/sec pending pending 960 GB/sec pending
Unlimited cache 128MB 32MB 64MB 96/192MB pending
Flagship SKUs Radeon RX 6900 XTX Radeon RX 7600XT? Radeon RX 7800XT?
Radeon RX 7700XT?
Radeon RX 7900XT? Radeon Pro
pending 330W ~150W ~250W ~350W pending
emission Q4 2020 Q4 2022? Q4 2022? Q4 2022? 2023?

Which next-generation AMD Radeon RX 7000 series graphics card are you most interested in?

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