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AMD RDNA 3 MCM GPUs Launch Schedule Revealed: Navi 31 For Radeon RX 7900 Series In Q4 2022, Navi 32 For Radeon RX 7800 Series In 1H 2023

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AMD next-gen MCM RDNA 3 GPUs for the Radeon RX 7000 series graphics cards have been detailed once again by Moore's Law is Dead. While the information revealed is pretty much the same that we've heard over the past few months, what's new are the launch schedules which show that AMD will release its flagship variants as early Q4 2022.

AMD Radeon RX 7000 Graphics Card Launch Schedules Rumored: Navi 31 For Radeon RX 7900 Series In Q4 2022, Navi 32 For Radeon RX 7800 Series in 1H 2023

Based on the latest information from MLID, both, the AMD Navi 31 and Navi 32 GPUs will utilize an MCM solution but there's a possibility that the Navi 31 GPU could make use of 3D-Stacking while the Navi 32 GPU could make of a standard multi-die approach, similar to AMD's Instinct MI250X. It looks like Navi 31 might get a similar design as the Instinct MI300 GPUs which are going to feature a 3D-stacking technology that fuses the GPUs on top of the IO die. We have heard rumors of Infinity Cache being on a separate die so that might be what's going on here. As for Navi 32, it will carry on the same design approach as MI200 series. Both the Navi 31 and Navi 32 GPUs will be composed of 6nm IO (MCD) and 5nm GPU (GCD) chiplets.

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As for the launch schedule, the AMD Navi 31 GPU will appear within the flagship Radeon RX 7900 series by end of Q4 2022. Do note that the Navi 33 GPUs based on 6nm Monolithic dies will be the first to hit shelves. The Navi 32 GPUs for the Radeon RX 7800 series will launch in the first half of 2023. Also, the reason why I don't believe Navi 33 GPUs will end up with the Radeon RX 7600 series branding and instead use Radeon RX 7700 series is simply the pricing.

AMD Navi 31 'Radeon RX 7000' series graphics cards might feature AIO cooled reference designs. (Image Credits: Moore's Law is Dead)

There are rumors that the Navi 33 graphics cards will end up in the $400-$500 US range and they are meant to replace the existing Navi 21 parts. As such, it doesn't make sense to brand a high-end graphics card as a *600 series product.

There was also a recent rumor about AMD Navi 31 featuring a total of 7 chiplets, one IOD, two GCD, and four MCD. So there will be two GCDs sitting on top of the IOD while the MCDs can either sit on top of the GCDs or the IOD. It will be one interesting GPU configuration to see and the start of the chiplet era in the gaming graphics consumer segment.

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AMD RDNA Generational GPU Lineup

Radeon LineupRadeon RX 5000Radeon RX 6000Radeon RX 7000Radeon RX 8000
GPU ArchitectureRDNA 1RDNA 2RDNA 3 / RDNA 2RDNA 4
Process Node7nm7nm5nm/6nm?5nm/3nm?
GPU FamilyNavi 1XNavi 2XNavi 3XNavi 4X
Flagship GPUN/ANavi 21 (5120 SPs)Navi 31 (15360 SPs)Navi 41
High-End GPUNavi 10 (2560 SPs)Navi 22 (2560 SPs)Navi 32 (10240 SPs)Navi 42
Mid-Tier GPUNavi 12 (2560 SPs)Navi 23 (2048 SPs)Navi 33 (5120 SPs)Navi 43
Entry-Tier GPUNavi 14 (1536 SPs)Navi 24 (1024 SPs)Navi 34 (2560 SPs)Navi 44

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.

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.

AMD RDNA 3 Navi 32 GPUs For Radeon RX 7800 Series

The AMD Navi 32 GPU will be one of the two MCM GPUs featured in the RDNA 3 lineup. The GPU will feature two GCD's (Graphics Compute Dies) and a singular MCD (Multi-Cache Die). The die is very similar to the flagship Navi 31 GPU but has one less Shader Engine across each die. The AMD Navi 32 GCD is expected to utilize TSMC's 5nm process node while the MCD will be based on a 6nm process node. Rumors are that AMD has the option to select between Samsung and TSMC for the 6nm die.

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)

Each GCD has 2 Shader Engines (4 in total) and each Shader Engine has 2 Shader Arrays (2 per SE / 4 per GCD / 8 in total). Each Shader Array is composed of 5 WGPs (10 per SE / 20 per GCD / 40 in total) and each WGP features 8 SIMD32 units with 32 ALUs (40 SIMD32 per SA / 80 per SE / 160 per GCD / 320 in total). These SIMD32 units combine to make up 5120 cores per GCD and 10,240 cores in total.

The Navi 32 (RDNA 3) MCD will be linked to the dual GCD's via a next-generation Infinity Fabric interconnect and feature 384 MB of Infinity Cache. Each GPU should also feature 3 memory connect links (32-bit). That's a total of 6 32-bit memory controllers for a 192-bit bus interface.

This would bring the performance of the AMD Radeon RX 7700 series above the RX 6800 and RX 6900 series, offering one big leap in graphics horsepower in games. This would also pump up the power numbers as the RX 6700 XT is currently rated at 230W but that could go up to 270-300W.

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 and power efficiency. It looks like AMD will take the lead by offering the first MCM-powered GPUs under its Radeon RX graphics card lineup.

AMD RDNA 3 Navi 3X GPU Configurations (Preliminary)

GPU NameNavi 21Navi 33Navi 32Navi 31
GPU Process7nm6nm5nm/6nm5nm/6nm
GPU PackageMonolithicMonolithicMCMMCM
Shader Engines424 (2 per GCD)6 (3 per GCD)
GPU WGPs4020-1640-32 (20-16 per GCD)60-48 (30-24 per GCD)
SPs Per WGP128256256256
Compute Units (Per Die) 8040-3280-64
160 -128 (Total)
120-96
240-192 (Total)
Cores (Per Die)51205120-40965120-40967689-6144
Cores (Total)5120512010240-819215360-12288
Memory Bus256-bit128-bit192-bit256-bit
Memory TypeGDDR6GDDR6GDDR6GDDR6
Infinity Cache128 MB128-256 MB384 MB512 MB
Flagship SKURadeon RX 6900 XTXRadeon RX 7700 XT?Radeon RX 7800 XT?Radeon RX 7900 XT?
TBP330W~200W~300W~400W
LaunchQ4 2020Q4 2022?Q4 2022?Q4 2022?

Which next-generation GPUs are you looking forward to the most?

Products mentioned in this post

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