r/AMD’s stblr has shared the alleged number of Compute Units, core clocks, and other key specifications for red team’s next-generation RDNA 2 GPUs (i.e., Navi 21, Navi 22, Navi 23). If these figures are correct, AMD’s next flagship (Radeon RX 6900 XT?) could boast 80 Compute Units, which translates to 5,120 Stream Processors. That happens to be twice the amount of red team’s current champion, the Radeon RX 5700 XT.
Here’s a brief breakdown (via VideoCardz and Wccftech) of what “Big Navi” and its lesser siblings will seemingly offer. Despite their fishy code names, AMD’s Radeon RX 6000 Series GPUs may be the furthest things from a flop – especially when pricing and efficiency are considered.
Navi 21 (Sienna Cichlid): Flagship
- 80 Compute Units
- 5,120 Stream Processors
- Boost clocks of up to 2,2200 MHz
- 22.5 TFLOPs of compute
Navi 22 (Navy Flounder): Mid-Ranged
- 40 Compute Units
- 2,560 Stream Processors
- Boost clocks of up to 2,500 MHz
- 12.8 TFLOPS of compute
Navi 23 (Dimgrey Cavefish): Entry Level
- 32 Compute Units
- 2,048 Stream Processors
The GPU table (which we’ve copied directedly below) also references a new discovery: Navi 31. This is believed to be AMD’s first RDNA 3 GPU, which should provide an even greater performance-per-watt improvement. Being that its values echo Navi 21 (e.g., 80 CUs), this could be a refresh of some sort.
| Property | Navi 10 | Navi 14 | Navi 12 | Navi 21 | Navi 22 | Navi 23 | Navi 31 |
|---|---|---|---|---|---|---|---|
| num_se | 2 | 1 | 2 | 4 | 2 | 2 | 4 |
| num_cu_per_sh | 10 | 12 | 10 | 10 | 10 | 8 | 10 |
| num_sh_per_se | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| num_rb_per_se | 8 | 8 | 8 | 4 | 4 | 4 | 4 |
| num_tccs | 16 | 8 | 16 | 16 | 12 | 8 | 16 |
| num_gprs | 1024 | 1024 | 1024 | 1024 | 1024 | 1024 | 1024 |
| num_max_gs_thds | 32 | 32 | 32 | 32 | 32 | 32 | 32 |
| gs_table_depth | 32 | 32 | 32 | 32 | 32 | 32 | 32 |
| gsprim_buff_depth | 1792 | 1792 | 1792 | 1792 | 1792 | 1792 | 1792 |
| parameter_cache_depth | 1024 | 1024 | 1024 | 1024 | 1024 | 1024 | 1024 |
| double_offchip_lds_buffer | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| wave_size | 32 | 32 | 32 | 32 | 32 | 32 | 32 |
| max_waves_per_simd | 20 | 20 | 20 | 16 | 16 | 16 | 16 |
| max_scratch_slots_per_cu | 32 | 32 | 32 | 32 | 32 | 32 | 32 |
| lds_size | 64 | 64 | 64 | 64 | 64 | 64 | 64 |
| num_sc_per_sh | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| num_packer_per_sc | 2 | 2 | 2 | 4 | 4 | 4 | 4 |
| num_gl2a | N/A | N/A | N/A | 4 | 2 | 2 | 4 |
| unknown0 | N/A | N/A | N/A | 10 | 10 | 8 | 10 |
| unknown1 | N/A | N/A | N/A | 16 | 12 | 8 | 16 |
| unknown2 | N/A | N/A | N/A | 80 | 40 | 32 | 80 |
| num_cus (computed) | 40 | 24 | 40 | 80 | 40 | 32 | 80 |
Additionally, there’s a second data set that provides insight on AMD’s upcoming “Van Gough” and “Rembrandt” APUs. While Van Gough will feature the same amount of Compute Units as its predecessors (8), Rembrandt will bump that specification up to 12. It also allegedly flaunts a PCIe 4.0 interface.
| Property | Renoir | Cezanne | Van Gogh | Rembrandt |
|---|---|---|---|---|
| num_se | 1 | 1 | 1 | 1 |
| num_cu_per_sh | 8 | 8 | 8 | 6 |
| num_sh_per_se | 1 | 1 | 1 | 2 |
| num_rb_per_se | 2 | 2 | 2 | 4 |
| num_tccs | 4 | 4 | 4 | 4 |
| num_gprs | 256 | 256 | 1024 | 1024 |
| num_max_gs_thds | 32 | 32 | 32 | 32 |
| gs_table_depth | 32 | 32 | 32 | 32 |
| gsprim_buff_depth | 1792 | 1792 | 1792 | 1792 |
| parameter_cache_depth | 1024 | 1024 | 512 | 256 |
| double_offchip_lds_buffer | 1 | 1 | 1 | 1 |
| wave_size | 64 | 64 | 32 | 32 |
| max_waves_per_simd | 10 | 10 | 16 | 16 |
| max_scratch_slots_per_cu | 32 | 32 | 32 | 32 |
| lds_size | 64 | 64 | 64 | 64 |
| num_sc_per_sh | N/A | 1 | 1 | 1 |
| num_packer_per_sc | N/A | 2 | 2 | 4 |
| num_gl2a | N/A | N/A | 4 | 4 |
| unknown0 | N/A | N/A | 8 | 6 |
| unknown1 | N/A | N/A | 4 | 4 |
| unknown2 | N/A | N/A | 8 | 12 |
| num_cus (computed) | 8 | 8 | 8 | 12 |
AMD will share more about the Radeon RX 6000 Series on October 28. If you haven’t gotten a look at red team’s new reference designs yet, you can check them out here and here.