A Linux update may have let slip AMD Big Navi's mammoth core specs

The summer of leaks continues, this time with the attention turning to AMD’s next-gen GPUs based on the RDNA 2 architecture, which we’ll find out more about on October 28. An enterprising redditor (via Tom’s Hardware) was digging around the Radeon Open Compute (ROCm) code and discovered what appears to be a specification list for two of AMD’s next generation GPUs.

GPU specification from the Linux Kernal Update
Parameter Sienna Cichlid Navy Flounder
gc_num_se 4 2
gc_num_cu_per_sh 10 10
gc_num_sh_per_se 2 2
gc_num_rb_per_se 4 4
gc_num_tccs 16 12
gc_num_gprs 1024 1024
gc_num_max_gs_thds 32 32
gc_gs_table_depth 32 32
gc_gsprim_buff_depth 1792 1792
gc_double_offchip_lds_buffer 1024 1024
gc_wave_size 32 32
gc_max_waves_per_simd 16 16
gc_lds_size 64 64
num_sc_per_sh 1 1
num_packer_per_sc 4 4

Details for two GPUs codenamed Sienna Cichlid (Navi 21, or Big Navi) and Navy Flounder (Navi 22 or 23) were revealed. Of most interest here is the fact that Big Navi does appear to confirm the rumours that it will be a 80 CU (Compute Unit) chip, while Navy Flounder appears to have 40 CUs. Multiply the top three numbers in the table to get the CU count. According to the document Big Navi will have a 256-bit memory bus, while Navy Flounder appears to have a 192-bit memory bus. 

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