AMD itself has confirmed that their next-generation RDNA 3 GPU-powered Radeon RX 7000 series will be based on 5nm and 6nm process nodes.
AMD Radeon RX 7000 'RDNA 3' Graphics Cards To Feature 5nm & 6nm GPU Process In MCM & Monolithic Designs
The information was posted under the LinkedIn of AMD's Infinity Data Fabric Silicon design engineer, Brian Walters, who has worked on various projects including the next-generation graphics lineup which includes RDNA 3 powered Navi 31, Navi 32, Navi 33, & Instinct MI300.
As per the details, it looks like previous rumors can now be confirmed where it was stated that the MCM GPUs will feature a hybrid 5nm and 6nm layout. The hybrid MCM chips include the Navi 31 & Navi 32 which will retail a 5nm process node for the GCD (Graphics Compute Dies) while the IOD will utilize a 6nm process node. The AMD Navi 33 GPU will be utilizing a monolithic package based on the 6nm process node.
The details also mention AMD's next-gen Instinct MI300 which will utilize a 6nm process node but will feature a monolithic design similar to the existing MI200 GPU. Earlier rumors have pointed out a quad GCD MCM GPU design for the next-gen Instinct lineup which will be totally insane.
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.
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 32 GPUs For Radeon RX 7700 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.
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.
AMD RDNA 3 Navi 33 GPUs For Radeon RX 7600 Series
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.
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 Name | Navi 21 | Navi 33 | Navi 32 | Navi 31 | Navi 3X |
|---|---|---|---|---|---|
| Codename | Sienna Cichlid | Hotpink Bonefish | Wheat Nas | Plum Bonito | TBD |
| 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 (TBD) |
| GPU Die Size | 520mm2 | 203mm2 (Only GCD) | 200mm2 (Only GCD) 425mm2 (with MCDs) | 300mm2 (Only GCD) 522mm2 (with MCDs) | TBD |
| Shader Engines | 4 | 2 | 3 | 6 | 8 |
| GPU WGPs | 40 | 16 | 30 | 48 | 64 |
| SPs Per WGP | 128 | 128 | 128 | 128 | 128 |
| Compute Units (Per Die) | 80 | 32 | 60 | 96 | 128 (per GPU) 256 (Total) |
| SPs (Per Die) | 5120 | 2048 | 3840 | 6144 | 4096 |
| ALUs (Per Die) | 5120 | 4096 | 7680 | 12288 | 16384 |
| Memory Bus | 256-bit | 128-bit | 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 | 16-18 Gbps | TBD | TBD | 20 Gbps | TBD |
| Memory Bandwidth | 512-576 GB/s | TBD | TBD | 960 GB/s | TBD |
| Infinity Cache | 128 MB | 32 MB | 64 MB | 96/192 MB | TBD |
| Flagship SKU | Radeon RX 6900 XTX | Radeon RX 7600 XT? Radeon RX 7700M? | Radeon RX 7800 XT? Radeon RX 7900M? | Radeon RX 7900 XTX | Radeon Pro |
| TBP (Max) | 330W | ~150W | ~250W | 335W | TBD |
| Launch | Q4 2020 | Q4 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. AMD also recently pointed out that its RDNA 3 lineup will be launching later this year.
AMD RDNA Generational GPU Lineup
| Radeon Lineup | Radeon RX 5000 | Radeon RX 6000 | Radeon RX 7000 | Radeon RX 8000 |
|---|---|---|---|---|
| GPU Architecture | RDNA 1 | RDNA 2 | RDNA 3 / RDNA 2 | RDNA 4 |
| Process Node | 7nm | 7nm | 5nm/6nm | 5nm/3nm? |
| GPU Family | Navi 1X | Navi 2X | Navi 3X | Navi 4X |
| Flagship GPU | N/A | Navi 21 (5120 SPs) | Navi 31 (6144 SPs) | Navi 41 (Cancelled?) |
| High-End GPU | Navi 10 (2560 SPs) | Navi 22 (2560 SPs) | Navi 32 (4096 SPs) | Navi 48 |
| Mid-Tier GPU | Navi 12 (2560 SPs) | Navi 23 (2048 SPs) | Navi 33 (2048 SPs) | N/A? |
| Entry-Tier GPU | Navi 14 (1536 SPs) | Navi 24 (1024 SPs) | Navi 34 (1024 SPs)? | Navi 44 |
News Sources: blue nugroho, Videocardz
