AMD Navi 2x, Navi 21 & Navi 31 Leak: Apple reveals many specs in the latest macOS 11 beta version

AMD Navi 2x, Navi 21 & Navi 31 Leak: Apple reveals many specs in the latest macOS 11 beta version

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The macOS 11 Big Sur beta latest code contains interesting information on the specs of the AMD Navi 2x graphics chip, which may be introduced as part of the Radeon RX 6000 product family. There is also mention of the Navi 31 GPU, which is already based on the RDNA3 architecture.

Reddit user stblr recently shared a datasheet with some details about AMD Navi 2x and Navi 31. Interestingly, the information comes directly from Apple, or rather from the code for the latest macOS 11 Big Sur beta. There is some interesting information about the number of computing units (CU), as well as clock speeds and power consumption. However, the specs are subject to change prior to launch, and it is also possible that the data refers to “Pro” versions of GPUs that are commonly used in Macs, so regular versions may have higher clock speeds.

GPUs:

Property Navi 10 Navi 14 Navi 12 Navi 21 Lite Navi 21 Navi 22 Navi 23 Navi 31
num_se 2 1 2 2 4 2 2 4
num_cu_per_sh 10 12 10 14 10 10 8 10
num_sh_per_se 2 2 2 2 2 2 2 2
num_rb_per_se 8 8 8 4 4 4 4 4
num_tccs 16 8 16 20 16 12 8 16
num_gprs 1024 1024 1024 1024 1024 1024 1024 1024
num_max_gs_thds 32 32 32 32 32 32 32 32
gs_table_depth 32 32 32 32 32 32 32 32
gsprim_buff_depth 1792 1792 1792 1792 1792 1792 1792 1792
parameter_cache_depth 1024 1024 1024 1024 1024 1024 1024 1024
double_offchip_lds_buffer 1 1 1 1 1 1 1 1
wave_size 32 32 32 32 32 32 32 32
max_waves_per_simd 20 20 20 20 16 16 16 16
max_scratch_slots_per_cu 32 32 32 32 32 32 32 32
lds_size 64 64 64 64 64 64 64 64
num_sc_per_sh 1 1 1 1 1 1 1 1
num_packer_per_sc 2 2 2 2 4 4 4 4
num_gl2a N/A N/A N/A 4 4 2 2 4
unknown0 N/A N/A N/A N/A 10 10 8 10
unknown1 N/A N/A N/A N/A 16 12 8 16
unknown2 N/A N/A N/A N/A 80 40 32 80
num_cus (computed) 40 24 40 56 80 40 32 80
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APUs:

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

The flagship Navi 21 GPU, codenamed Sienna Cichlid, comes with 80 CUs. Interestingly, macOS 11 lists two graphics card options, which could be an additional sign that AMD is planning a variant with HBM2 and one with GDDR6 graphics memory. Navi 21A delivers an overclocked 2050MHz at 200W TGP, while Navi 21B reaches 2200MHz at 238W.

Equipped with 40 computing units

In the middle class, the Navi 22 can be found under the code name Navy Flounder. The graphics chip is equipped with 40 computing units, the clock speed is indicated as a maximum of 2500 MHz, the TGP is 170 watts. The specs for the entry-level Navi 23 GPU, codenamed Dimgrey Cavefish, are not yet very detailed, apart from the fact that the GPU is equipped with 32 CUs. Rumor has it that this could be a graphics chip for the upcoming MacBook Pro.

The information about the high-performance GPU Navi 31 RDNA3 is the same as that of the Navi 21. However, this could be placeholder information because even Apple may not have more detailed information about the graphics chip yet, which is only available in more due to the market via year.

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