AMD Flagship RDNA 3 Navi 31 GPU Allegedly Codenamed ‘Plum Bonito’ & Uses ‘Gemini’ Board, Next-Gen RDNA 4 May Land As ‘GFX1200’ Series


AMD might once again be going with codenames that are named after fish for its next-gen RDNA 3-powered Navi 3X lineup. The latest codenames seem to have been discovered by @Kepler_L2 over on Twitter.

AMD RDNA 3 Navi 31 GPU Allegedly Codenamed 'Plum Bonito' & Utilizes 'Gemini' Board

Starting with the RDNA 2 lineup, AMD started using various fish names for its internal GPU naming scheme. The current-gen flagship, the RDNA 2 based Navi 21 GPU,  was codenamed 'Sienna Cichlid' and it looks like the next-gen flagship, the RDNA 3 based Navi 31 GPU, will be following tradition & be known as 'Plum Bonito'. Now Plum Bonito isn't actually a fish but actually a dish made out of the fish. The wiki description for the Bonito fish reads:

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Bonitos are a tribe of medium-sized, ray-finned predatory fish in the family Scombridae – a family it shares with the mackerel, tuna, and Spanish mackerel tribes, and also the butterfly kingfish.

via Wikipedia

It is also stated that AMD's RDNA 3-powered Navi 31 GPU will be infused onto the Gemini board & which should be the reference board for the upcoming flagship.

Learning codenames of upcoming GPUs is already fascinating. AMD is still going to utilize its stars naming convention for the CDNA-X powered lineup while the gaming RDNA GPUs are going to end up with more fishy codenames. And in addition to that, Kepler also seems to have spotted that the next-generation RDNA 4 lineup may fall under the 'GFX1200' series. The RDNA 3 lineup has already been confirmed as the 'GFX1100' in Linux while the RDNA 2 parts were labeled under the 'GFX1030' series. The first-generation RDNA parts were referred to under the 'GFX1010' internal-naming convention.

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 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 Serues
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 Raphael RDNA 2 Ryzen 7000?
GFX1100 Navi 31 Plum Bonito RDNA 3 Radeon RX 7900?
GFX1101 Navi 3X RDNA 3 Discrete GPU
GFX1102 Navi 3X RDNA 3 Discrete GPU
GFX1103 Navi 3X Phoenix? RDNA 3 Ryzen 7000 APU?
GFX1200 Navi 4X RDNA 4 Radeon RX 8000?

AMD RDNA 3 Navi 31 GPUs For Radeon RX 7900 Series

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.

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Initially, the Navi 31 GPU configuration featured two GCDs (Graphics Core Die) and a single MCD (Multi-Cache Die). Each GCD has 3 Shader Engines (6 in total) and each Shader Engine has 2 Shader Arrays (2 per SE / 6 per GCD / 12 in total). Each Shader Array is composed of 5 WGPs (10 per SE / 30 per GCD / 60 in total) and each WGP features 8 SIMD32 units with 32 ALUs (40 SIMD32 per SA / 80 per SE / 240 per GCD / 480 in total). These SIMD32 units combine to make up 7,680 cores per GCD and 15,360 cores in total.

But that specification has since been toned down and as per the latest rumors, the AMD Navi 31 GPU with RDNA 3 architecture is now expected to offer 48 WGPs, 12 SAs, and 6 SEs. This will give out a total of 12,288 stream processors which is lower than the previous count. This will also drop the overall compute performance unless AMD goes crazy with over 3.0 GHz clock frequencies on its flagship part.

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

The Navi 31 (RDNA 3) MCD will be linked to the dual GCD's via a next-generation Infinity Fabric interconnect and feature 256-384 MB of Infinity Cache. Each GPU should also feature 4 memory connect links (32-bit). That's a total of 8 32-bit memory controllers for a 256-bit bus interface.

There are also rumors about 3D Stacking on the flagship Navi 31 GPU and the launch is currently expected in the second half of  2022.

Upcoming Flagship AMD, Intel, NVIDIA GPU Specs (Preliminary)

GPU NameAD102Navi 31Xe2-HPG
CodenameAda LovelaceRDNA 3Battlemage
Flagship SKUGeForce RTX 4090 SeriesRadeon RX 7900 SeriesArc B900 Series
GPU ProcessTSMC 4NTSMC 5nm+ TSMC 6nmTSCM 5nm?
GPU PackageMonolithicMCD (Multi-Chiplet Die)MCM (Multi-Chiplet Module)
GPU DiesMono x 12 x GCD + 4 x MCD + 1 x IODQuad-Tile (tGPU)
GPU Mega Clusters12 GPCs (Graphics Processing Clusters)6 Shader Engines10 Render Slices
GPU Super Clusters72 TPC (Texture Processing Clusters)30 WGPs (Per MCD)
60 WGPs (In Total)
40 Xe-Cores (Per Tile)
160 Xe-Cores (Total)
GPU Clusters144 Stream Multiprocessors (SM)120 Compute Units (CU)
240 Compute Units (in total)
1280 Xe VE (Per Tile)
5120 Xe VE (In Total)
Cores (Per Die)18432 CUDA Cores7680 SPs (Per GCD)
15360 SPs (In Total)
20480 ALUs (In Total)
Peak Clock~2.85 GHz~3.0 GHzTBD
FP32 Compute~105 TFLOPs~92 TFLOPsTBD
Memory Capacity24 GB32 GBTBD
Memory Bus384-bit256-bitTBD
Memory Speeds~21 Gbps~18 GbpsTBD
Cache Subsystems96 MB L2 Cache512 MB (Infinity Cache)TBD
LaunchQ4 2022Q4 20222023
Which next-generation GPUs are you looking forward to the most?

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