AMD and NVIDIA are progressing in an orderly and steady manner. Although it is not very likely that AMD will see a new generation of graphics cards within this year, even if it can be seen, it will be at the end of the year, but various news will gradually leak out. Now Someone found clues about the RDNA 3 architecture graphics card in the Linux driver code.
According to a report by videocardz, MCD_INSTANCE_NUM is listed in an AMDGPU Linux driver. This is the assumed video memory of RDNA 3 Navi 31 GPU that matches the number of it/controller chips. Interestingly, AMD replaced MCD with UMC_NODE a week later. , obviously to deliberately hide this secret.
This roughly confirms the rumors that the Navi 31 GPU has a GCD (Graphics Computing Chip) and six MCD (Multiple Cache I/O Chips). This card is likely to have a 384-bit video memory width, and may have a 192MB Infinity Cache. If AMD uses 3D V-Cache on each MCD, the cache capacity will be increased to 384MB. In fact, in May this year, the design block diagram of Navi 31 GPU was leaked. From the picture, it can be seen that this GPU is quite large, but the specific size is not clear.
With 384bit memory bandwidth and 18Gbps GDDR6 memory, the memory bandwidth of the new flagship Radeon RX 7900 series graphics card can reach 864GB/s, which is 50% higher than RX 6950XT. This value does not include the bandwidth of Infinity Cache, which The cache capacity is also 50% larger than the current Navi 21.
