As we get closer to its announcements, AMD Big Navi is around the corner and they would like some momentum. More rumors are spreading the spiders' cyber web right now. AMD would be announcing two Big Navi based models based on the NAVI 21 and NAVI22.
With a bit of luck, AMD will compete with the RTX 3070 with NAVI22 (codename Navy Flounder) and perhaps the NAVI21 (codename Sienna Cichlid aka TAFKABN - The artist formerly known as big navi). We hope it has enough power to battle the RTX 3080. That has to been seen though, but rumors are strong right now that Navi 21 would be paired with 16GB of VRAM (and that is an advantage over the 3080 VRAM wise), Navi 22 would get 12GB. What type of graphics memory that would be is a mystery, GDDR6 or GDDR6X? Meanwhile, the naming also remains to be a mystery, so we'll call it Radeon RX 6900 PRO and 6900XT for now (for the flagship products of course). The source for VRAM amounts is rogame, so please do take all this with that typical grain of salt.
On its end, Videocardz reports that Navi Flounder, frack I'll keep calling it NAVI22 which is easier to remember, would get 40 Compute Units, that's the same as Navi 10. If each Compute Unit still holds 64 shading Processors, Navy Flounder would feature 2560 unified cores (same as Radeon RX 5700 XT), the memory bus would reportedly be configured at 192 or 384-bit (depending on configuration).
| AMD Navi 2x (RDNA2) vs Navi 1x (RDNA 1) Graphics Processors | |||||
|---|---|---|---|---|---|
| Parameter | Navi 10 | Navi 14 | Navi 12 | Sienna Cichlid | Navy Flounder |
| gc_num_se (1) | 2 | 1 | 2 | 4 | 2 |
| gc_num_cu_per_sh (2) | 10 | 12 | 10 | 10 | 10 |
| gc_num_sh_per_se (3) | 2 | 2 | 2 | 2 | 2 |
| Compute Units (1 x 2 x 3) | 40 | 24 | 40 | 80 | 40 |
| gc_num_rb_per_se | 8 | 8 | 8 | 4 | 4 |
| gc_num_tccs | 16 | 8 | 16 | 16 | 12 |
| gc_num_gprs | 1024 | 1024 | 1024 | 1024 | 1024 |
| gc_num_max_gs_thds | 32 | 32 | 32 | 32 | 32 |
| gc_gs_table_depth | 32 | 32 | 32 | 32 | 32 |
| gc_gsprim_buff_depth | 1792 | 1792 | 1792 | 1792 | 1792 |
| gc_double_offchip_lds_buffer | 1024 | 512 | 1024 | 1024 | 1024 |
| gc_wave_size | 32 | 32 | 32 | 32 | 32 |
| gc_max_waves_per_simd | 20 | 20 | 20 | 16 | 16 |
| gc_lds_size | 64 | 64 | 64 | 64 | 64 |
| num_sc_per_sh | 1 | 1 | 1 | 1 | 1 |
| num_packer_per_sc | 2 | 2 | 2 | 4 | 4 |
Sources: Reddit via @TUM_APISAK via Videocardz via Rogame
Rumor: AMD Radeon Big Navi has 16GB VRAM (NAVI21), and 12GB for NAVI22
