AMD Next-Gen RDNA 3 Navi 31 & Navi 33 GPUs Listed In ROCm OpenGPU Platform

AMD Radeon RX 7900 XT's Navi 31 GPU Based on RDNA 3 Architecture Detailed - First Gaming Graphics Card With MCM Design

AMD has officially confirmed two of its next-generation RDNA 3 GPUs, the Navi 31 and Navi 33, which have been added to the support list of the ROCm GPUOpen platform. Aside from these, ROCm listing also confirms Rembrandt and Van Gogh APUs.

AMD RDNA 3 Navi 31 & Navi 33 GPUs Confirmed In Latest ROCm OpenGPU Platform Support List

Spotted by Komachi, the latest developer tools update for AMD's ROCm OpenGL platform lists down the next-generation RDNA 3 based Navi 31 and Navi 33 GPUs. There were recent reports which alleged that AMD will be taping out its next-generation GPUs later this year & this could possibly be preliminary support for developers.

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AMD Next-Gen RDNA 3 Based Navi 31 and Navi 33 GPUs spotted within AMD's ROCm OpenGPU Platform update. (Image Source: Komachi)

AMD RDNA 3 Navi 31 GPUs For Radeon RX 7800/7900 Series

The AMD Navi 31 GPU, the flagship RDNA 3 chip, would power the next-gen 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.

A preliminary block diagram of AMD's next-gen RDNA 3 based Navi 31 GPU that will power the flagship Radeon RX 7900 XT graphics card. (Image Credits: Olrak)

The Navi 31 GPU configuration shown here features two GCD's (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.

The Navi 31 (RDNA 3) MCD will be linked to the dual GCD's via a next-generation Infinity Fabric interconnect and feature 256-512 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 have been several rumors stating that the upcoming RDNA 3 GPUs are going to outperform whatever NVIDIA has to offer in terms of rasterization performance. It looks like AMD will take the lead by offering the first MCM-powered GPUs under its Radeon RX graphics card lineup. But at the same time, NVIDIA is expected to quickly transition to its MCM GPU lineup which will offer over 3x performance boost over Ampere GPUs.

AMD RDNA 3 Navi 33 GPUs For Radeon RX 7600 Series

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The AMD Navi 33 GPU 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.

A preliminary block diagram of AMD's next-gen RDNA 3 based Navi 33 GPU that will power the flagship Radeon RX 7600 XT graphics card. (Image Credits: Olrak)

The Navi 33 GCD has 2 Shader Engines and each Shader Engine has 2 Shader Arrays (2 per SE / 4 in total). Each Shader Array is composed of 5 WGPs (10 per SE / 20 total) and each WGP features 8 SIMD32 units with 32 ALUs (40 SIMD32 per SA / 80 per SE / 160 total). These SIMD32 units combine to make up 5120 cores which is the same core count as the RX 6900 XT (Navi 21 XTX GPU).

The Navi 33 (RDNA 3) is expected to carry 256 MB of Infinity Cache. Each GPU should also feature 2 memory connect links (32-bit). That's a total of 4 32-bit memory controllers for a 128-bit bus interface. This would bring the performance of the AMD Radeon RX 7600 series above the RX 6800 and RX 6900 series at a TDP of around 200W.

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?

The AMD RDNA 3 'Navi 3X' GPU-powered Radeon RX graphics card lineup is expected to offer up to 3x performance improvement over existing RDNA 2 offerings. It would mark a major leap forward for graphics evolution and now that AMD is already onboard with next-gen technologies such as FSR and Raytracing, expect a very heated next-gen competition between the red and green teams.

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