AMD RDNA 3 GPUs For Radeon RX 7000 Graphics Cards Detailed – Navi 31 “Plum Bonito”, Navi 32 “Wheat Nas”, Navi 33 “Hotpink Bonefish”

AMD RDNA 3 'Navi 31' MCM GPUs Allegedly Rock Up To 384 MB of Infinity Cache In 3D V-Cache Flavors

Tech outlet Angstronomics has a very detailed roundup published regarding the specifications of AMD's RDNA 3 GPUs such as the Navi 31, Navi 32, and Navi 33 chips that will go on to 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 there are going to be at least four RDNA 3 IPs that will be launched for the consumer segment. These include Navi 31, Navi 32, Navi 33, and an APU design known as Pink Sardine.

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GRAPHICS ARCHITECTURE GPU CODENAME ALTERNATIVE NAME ARCHITECTURE PRODUCT
GFX900 VEGA 10 GCN 5.0 RX VEGA / Radeon Pro
GFX902 RAVEN Raven Ridge / Picasso GCN 5.0 Ryzen 2000/3000(G/GE)
GFX904 VEGA 12 GCN 5.0 Vega Pro 20 (MAC)
GFX906 VEGA 20 GCN 5.0 Radeon VII / Radeon Pro VII
GFX908 ARCTURUS CDNA 1 Instinct MI100
GFX90A Aldebaran CDNA 2 Instinct MI200
GFX909 RAVEN2 GCN 5.0 TBC
GFX909 RENOIR GCN 5.0 Ryzen 4000(H/U/G)
GFX1010 NAVI 10 RDNA 1 RX 5700/5600(M/XT)
GFX1011 NAVI 12 RDNA 1 PRO 5600M (MAC)
GFX1012 NAVI 14 RDNA 1 RX 5500 (M/XT)
GFX1030 NAVI 21 Big Navi / Sienna Cichlid RDNA 2 RX 6900/6800 Series
GFX1031 NAVI 22 Navy Flounder RDNA 2 RX 6700 Series
GFX1032 NAVI 23 Dimgrey Cavefish RDNA 2 RX 6600 Series
GFX1033 NAVI 24 Beige Goby RDNA 2 RX 6500/6400 Series
GFX1033 Van Gogh Aerith RDNA 2 Steam Deck
GFX1036  Navi 2X Raphael RDNA 2 Radeon 700M
GFX1040 VAN GOGH LITE VAN GOGH LITE RDNA 2 TBC
GFX1100 Navi 31 Plum Bonito RDNA 3 Radeon RX 7000
GFX1101 Navi 32  Wheat Nas RDNA 3 Radeon RX 7000
GFX1102 Navi 33  Hotpink Bonefish RDNA 3 Radeon RX 7000
GFX1103 Navi 3X Phoenix / Pink Sardine RDNA 3 Radeon 700M
GFX1200 Navi 4X RDNA 4 Radeon RX 8000?

Now Angstronomics has reported information such as die sizes, GPU configurations, and features that may end up in the final retail products. An interesting statement by the tech outlet has been made which reveals that configurations for Navi 3X GPUs were first formulated in 2019 and then finalized sometime in 2020. These specifications have not been changed since however, various rumors have pointed out two different specifications for the GPUs which means that either AMD has in fact made changes since their final designs or those rumors were simply not aligned with the truth. With that said, let's see what sort of configurations we can expect with the Navi 3x "RDNA 3" GPU lineup.

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

AMD confirmed that its RDNA 3 GPUs will be coming later this year with a huge performance uplift. The company's Senior Vice President of Engineering, Radeon Technologies Group, David Wang, said that the next-gen GPUs for Radeon RX 7000 series will offer over 50% performance per watt uplift vs the existing RDNA 2 GPUs. Some of the key features of the RDNA 3 GPUs highlighted by AMD will include:

  • 5nm Process Node
  • Advanced Chiplet Packaging
  • Rearchitected Compute Unit
  • Optimized Graphics Pipeline
  • Next-Gen AMD Infinity Cache
  • >50% Perf/Watt vs RDNA 2

Gamers should expect fluid 4K gaming to be buttery smooth on these graphics 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, the flagship RDNA 3 chip, would power the next-gen enthusiast cards such as the Radeon RX 7900 XT graphics card. We have heard that AMD will drop CU (Compute Units) in favor of WGP (Work Group Processors) on its next-gen RDNA 3 GPUs. Each WGP will house dual CU (Compute Units) but with twice the SIMD32 clusters as opposed to just 2 on each CU within RDNA 2. Rumors are that AMD has the option to select between Samsung and TSMC for the 6nm die.

  • AMD Navi 31: 12288 Cores, 384-bit Bus, 192 MB Infinity Cache, 308mm2 GPU Die @5nm
  • AMD Navi 21: 5120 Cores, 384-bit Bus, 128 MB 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 will give out a total of 12,288 SPs or stream processors. This is an increase of 2.4x in cores compared to the 5120 SPs featured on the Navi 21 GPU. The GPU or the Navi 31 GCD is said to measure 308mm2 and will come packaged on TSMC's 5nm process node.

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The Navi 31 GPU will also carry 6 MCD's which will feature 16 MB Infinity Cache per die and are also likely to carry the 64-bit (32-bit x 2) memory controllers that will provide the chip with a 384-bit bus interface. While this equals 96 MB of Infinity Cache which is lower than the 128 MB featured on the current Navi 21 GPUs, there's also a 3D-Stacked solution in the works which was pointed out recently and that would double the Infinity Cache with 32 MB (16 MB 0-hi + 16 MB 1-hi) capacities for a total of 192 MB of cache. This is a 50% increase versus the current Navi 21 design and it also makes Navi 31 the first GPU with both, chiplet and 3D stacked designs. These chiplets or MCD's will be fabricated on TSMC's 6nm process node and measure 37.5mm2 each.

The outlet reports that there was an even higher 288 MB (16 MB 0-Hi + 16 MB 1-Hi + 16 MB 2-Hi) MCD package planned but that was scrapped due to cost-benefit reasons. There are also talks of a cut-down variant of the Navi 31 GPU which will feature 42 WGPs or 10,752 cores and 5 MCDs for 80MB Infinity Cache across a 320-bit bus interface.

Now, this is going to result in higher power draw and AMD seems to have confirmed this much that their next-generation graphics card lineup will feature 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 input for power and feature an updated triple-fan cooling design which is slightly taller than the one currently in use.

AMD Navi 32 "Wheat Nas" GPU Configuration

The AMD Navi 32 GPU codenamed "Wheat Nas" is also one of the two MCM GPUs featured in the RDNA 3 lineup. The GPU will feature a single GCD (Graphics Compute Dies) and four MCDs (Multi-Cache Die). The GPU or GCD is said to measure 200mm2 while each MCD will retain the same size at 37.5mm2.

  • AMD Navi 32: 7680 Cores, 256-bit Bus, 64 MB Infinity Cache, 200mm2 GPU Die @5nm
  • AMD Navi 22: 2560 Cores, 192-bit Bus, 96 MB Infinity Cache, 335mm2 GPU Die @7nm

The GCD will be equipped with 3 Shader Engines and each Shader Engine has 6 Shader Arrays (18 in total). The GPU will feature a total of 30 WGP or 60 Compute Units for a total of 7680 cores. This rounds up to >50% more cores than the Navi 31 flagship.

Each MCD should also feature 2 memory connect links (32-bit). That's a total of 8 32-bit memory controllers for a 256-bit bus interface. Each MCD will retain the 16 MB 0-Hi capacity but there does not seem to be any 1-Hi variant which means that the chip will have just 64 MB maximum configs. That Navi 32 GPU is said to launch in 2023 and will be the highest chip for mobile and mid-tier chip for desktops. The GPU would be first rolled out to the mobile segment and might be announced at CES 2023 which makes ideal sense since we will 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 start the monolithic segment within the RDNA 3 family. The GPU will feature a single die. The die is very similar to the flagship Navi 21 GPU and is expected to utilize a 6nm process node for fabrication with a die size of 203mm2.

  • AMD Navi 33: 4096 Cores, 128-bit Bus, 32 MB Infinity Cache, 335mm2 GPU Die @6nm
  • AMD Navi 23: 2048 Cores, 128-bit Bus, 32 MB Infinity Cache, 237mm2 GPU Die @7nm

The Navi 33 GCD is expected to feature 2 Shader Engines and each Shader Engine has 2 Shader Arrays (2 per SE / 4 in total). This rounds up to 16 WGP's 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 come packaged with 32 MB of Infinity Cache, the same amount as the Navi 23 GPU, and across a 128-bit wide bus. Just like the Navi 32 GPUs, the Navi 33 chips will be focused first on the mobile lineup with early graphics performance putting them ahead of the Intel Arc Alchemist lineup at less than half the cost & while pulling less power.

The outlet also talks about two new features coming to AMD RDNA 3 Navi 3x GPUs for Radeon RX 7000 series graphics cards such as:

OREO

One of the features in the RDNA 3 graphics pipeline is OREO: Opaque Random Export Order, which is just one of the many area saving techniques. With gfx10, the pixel shaders run out-of-order, where the outputs go into a Re-Order Buffer before moving to the rest of the pipeline in-order. With OREO, the next step (blend) can now receive and execute operations in any order and export to the next stage in-order. Thus, the ROB can be replaced with a much smaller skid buffer, saving area.

Infinity Cache Updates

The Memory Attached Last Level (MALL) Cache blocks are each halved in size, doubling the number of banks for the same cache amount. There are also changes and additions that increase graphics to MALL bandwidth and reduce the penalty of going out to VRAM.

via Angstronomics

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

AMD RDNA 3 Navi 3X GPU Configurations (Preliminary)

GPU NameNavi 21Navi 33Navi 32Navi 31Navi 3X
CodenameSienna CichlidHotpink BonefishWheat NasPlum BonitoTBD
GPU Process7nm6nm5nm/6nm5nm/6nm5nm/6nm
GPU PackageMonolithicMonolithicMCM (1 GCD + 4 MCD)MCM (1 GCD + 6 MCD)MCM (TBD)
GPU Die Size520mm2203mm2 (Only GCD)200mm2 (Only GCD)
425mm2 (with MCDs)
308mm2 (Only GCD)
533mm2 (with MCDs)
TBD
Shader Engines42468
GPU WGPs4016304864
SPs Per WGP128256256256256
Compute Units (Per Die) 80326096128 (per GPU)
256 (Total)
Cores (Per Die)512040967680122888192
Cores (Total)5120409676801228816,384
Memory Bus256-bit128-bit256-bit384-bit384-bit x2?
Memory TypeGDDR6GDDR6GDDR6GDDR6GDDR6
Memory CapacityUp To 16 GBUp To 8 GBUp To 16 GBUp To 24 GBUp To 32 GB
Memory Speed16-18 GbpsTBDTBD20 GbpsTBD
Memory Bandwidth512-576 GB/sTBDTBD960 GB/sTBD
Infinity Cache128 MB32 MB64 MB96/192 MBTBD
Flagship SKURadeon RX 6900 XTXRadeon RX 7600 XT?Radeon RX 7800 XT?
Radeon RX 7700 XT?
Radeon RX 7900 XT?Radeon Pro
TBP330W~150W~250W~350WTBD
LaunchQ4 2020Q4 2022?Q4 2022?Q4 2022?2023?
Which next-gen AMD Radeon RX 7000 series graphics card are you interested for the most?

Products mentioned in this post

Radeon VII
USD 1,163
RX 5500
USD 499
rx 6800
USD 584
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