AMD has confirmed the highest number of compute units for three RDNA 3 GPUs including the yet to be released Navi 32 and Navi 33 chips.
AMD RDNA 3 GPU compute units confirmed: Navi 31 with 96, Navi 32 with 60, Navi 33 with 32
The number of computing units for the AMD RDNA 3 GPU lineup hasn’t been a mystery since the leak from Angstronomics but this leak comes directly from AMD in the form of an update to the ROCm software that was discovered by @tweet. The update mentions the peak core count for RDNA 3 chips which are as follows:
- Navi 31 GPU = 96 compute units
- Navi 32 GPU = 60 compute units
- Navi 33 GPU = 32 compute units
AMD Navi 31 “Plum Bonito” GPU Configuration
The AMD Navi 31 GPU, the flagship RDNA 3 chip, will power next-generation enthusiast cards like the Radeon RX 7900 XTX and RX 7900 XT graphics card. Each WGP will have dual CU (computation units) but with double the SIMD32 clusters vs. only 2 in each CU within RDNA 2. The chip uses a combination of TSMC 5nm (GCD) and TSMC 6nm (MCD) process nodes.
- AMD Navi 31: 12288 cores, 384-bit bus, 96MB infinity cache, GPU 300mm2 @ 5nm
- AMD Navi 21: 5120 cores, 384-bit bus, 128MB infinity cache, GPU 520mm2 @ 7nm
The AMD Navi 31 GPU with RDNA 3 architecture is expected to offer a single GCD with 96 compute units, 48 WGPs, 12 SAs, and 6 SEs. This will give a total of 6144 SP or 12288 centers. This is a 2.4x increase in cores compared to the 5120 featured cores in the Navi 21 GPU.
The Navi 31 GPU will also carry 6 MCDs which will have an infinity cache of 16MB per die, and will also carry 64-bit (32-bit x 2) memory controllers that will provide the chip with a 384-bit bus interface. These chips, or MCDs, will be manufactured on TSMC’s 6nm process node measuring 37.5mm in diameter2 All.
AMD Navi 32 “Wheat Nas” GPU Configuration
The AMD Navi 32 GPU codenamed “Wheat Nas” is also one of two MCM GPUs in the RDNA 3 family. The GPU will have one GCD (Graphics Compute Die) and four MCD (Multi Die Cache). The GPU or GCD is said to measure 200mm2 While each MCD will keep the same size at 37.5mm2.
- AMD Navi 32: 7680 cores, 256-bit bus, 64MB infinity cache, GPU 200mm2 @ 5nm
- AMD Navi 22: 2560 cores, 192-bit vector, 96MB Infinity Cache, 335mm2 GPU Die @ 7nm
GCD will be equipped with 3 Shader Engines and each Shader Engine contains 6 Shader Arrays. The GPU will have a total of 30 WGP or 60 Compute Units for a total of 7680 cores. Each MCD must also have two memory interconnect links (32-bit). That’s a total of 8 32-bit memory controllers for a 256-bit bus interface.
AMD Navi 32 “Hotpink Bonefish” GPU Configuration
The AMD Navi 33 GPU codenamed “Hotpink Bonefish” will start the monolithic segment under the RDNA 3 family. The GPU will have a single die. The die is very similar to the flagship Navi 21 GPU and is expected to use a 6nm process node for manufacturing with a die size of 203mm2.
- AMD Navi 33: 4096 Cores, 128-bit Bus, 32MB Infinity Cache, 335mm2 GPU Die @ 6nm
- AMD Navi 23: 2048 Cores, 128-bit Bus, 32MB Infinity Cache, 237mm2 GPU Die @ 7nm
The Navi 33 GCD is expected to have two Shader Engines, and each Shader Engine has two Shader Arrays (2 per SE/4 in total). This rounds up to 16 WGP 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 packed with 32MB of Infinity Cache, which is the same size as the Navi 23 GPU, and across a 128-bit wide bus.
The first AMD RDNA 3 GPUs will be released in the form of the Navi 31-powered Radeon RX 7900 XTX and RX 7900 XT graphics card on December 13. We are likely to get Navi 32 and Navi 33 GPUs in the first half of 2023 with the announcement of Navi 32 navigation GPUs expected at CES 2023.
AMD RDNA 3 Navi 3X GPU Configurations (Initial)
| GPU name | Navi 21 | Navi 33 | Navi 32 | Navi 31 | Navi 3X |
|---|---|---|---|---|---|
| Code name | Sienna cichlid | Hotpink bonefish | Wheat is people | Plum bonito | to be announced later on |
| GPU process | 7 nm | 6 nm | 5 nm / 6 nm | 5 nm / 6 nm | 5 nm / 6 nm |
| GPU package | congener | congener | MCM (1 GCD + 4 MCD) | MCM (1 GCD + 6 MCD) | million cubic meters (to be determined) |
| GPU template size | 520 mm2 | 203 mm2 (GCD only) | 200mm2 (GCD only) 425 mm2 (with MCDs) | 308 mm2 (GCD only) 533 mm2 (with MCDs) | to be announced later on |
| shader drives | 4 | 2 | 4 | 6 | 8 |
| GPU WGPs | 40 | 16 | 30 | 48 | 64 |
| SP per WGP | 128 | 256 | 256 | 256 | 256 |
| Account units (per template) | 80 | 32 | 60 | 96 | 128 (per GPU) 256 (total) |
| cores (per die) | 5120 | 4096 | 7680 | 12288 | 8192 |
| cores (total) | 5120 | 4096 | 7680 | 12288 | 16384 |
| memory bus | 256 bits | 128 bits | 256 bits | 384 bits | 384 bits 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 | to be announced later on | to be announced later on | 20 Gbps | to be announced later on |
| memory bandwidth | 512-576 GB / s | to be announced later on | to be announced later on | 960 GB / s | to be announced later on |
| Infinity Cash | 128 MB | 32 MB | 64 MB | 96/192 MB | to be announced later on |
| Major SKU | Radeon RX 6900 XTX | Radeon RX 7600 XT? | Radeon RX 7800 XT? Radeon RX 7700 XT? | Radeon RX 7900 XT? | Radeon Pro |
| TBP | 330 watts | ~150 watts | ~250 watts | ~350 watts | to be announced later on |
| release | Fourth quarter 2020 | Fourth quarter 2022? | Fourth quarter 2022? | Fourth quarter 2022? | 2023? |
News source: Videocardz