AMD Navy Flounder to feature 40 CUs and 192-bit memory bus

Published: 22nd Sep 2020, 11:59 GMT   Comments

Please note that this post is tagged as a rumor.

AMD Sienna Cichlid and Navy Flounder specifications

AMD RDNA2-based graphics cards (Rumored Radeon RX 6700/6800 – left, Rumored RX 6900 series – right)

The next-generation desktop graphics processors based on AMD RDNA2 architecture are expected to debut on October 28th. AMD did not confirm which GPUs will be unveiled but the manufacturer did announce it will reveal Radeon RX 6000 series, so there are at least two cards coming.

AMD is allegedly developing three Navi 2X GPUs: Navi 21, Navi 22, and Navi 23. Only Navi 21 (Big Navi) has been confirmed to carry a codename of Sienna Cichlid, while the Navy Flounder codename could refer to either 23 or 22.

It is expected that the higher the Navi suffix the lower the GPU will be positioned in the lineup. Thus, the Navi 21 is going to be the top tier GPU, while 23 is likely to land in an entry-level space.

Only leaks Sienna Cichlid and Navy Flounder leaks have been appearing in open-source software patches, such as Linux kernel or, like in this example, ROCm software.

Reddit stblr discovered that the recent ROCm update (3.8) features firmware for Navy Flounder. This file contains variables defining the configuration of the graphics processor.

The Navi Flounder is believed to offer 40 Compute Units, just as many as Navi 10, but the memory bus width is rumored to be limited to 192-bit. This is not confirmed, of course, but it is a result of the simple multiplication of three variables present in the firmware data. Assuming that each Compute Unit carries exactly 64 Stream Processors, the Navy Flounder would feature 2560 unified cores.

Unless there is something that we do not know yet, the GPU would land in a mid-range space, competing directly with yet unannounced NVIDIA Ampere GA106 GPU (also debuting with the 192-bit bus).

AMD Navi 2x (RDNA2) vs Navi 1x (RDNA 1) Graphics Processors
ParameterNavi 10Navi 14Navi 12Sienna CichlidNavy Flounder
gc_num_se (1)21242
gc_num_cu_per_sh (2)1012101010
gc_num_sh_per_se (3)22222
Compute Units (1 x 2 x 3)4024408040
gc_num_rb_per_se88844
gc_num_tccs168161612
gc_num_gprs10241024102410241024
gc_num_max_gs_thds3232323232
gc_gs_table_depth3232323232
gc_gsprim_buff_depth17921792179217921792
gc_double_offchip_lds_buffer1024512102410241024
gc_wave_size3232323232
gc_max_waves_per_simd2020201616
gc_lds_size6464646464
num_sc_per_sh11111
num_packer_per_sc22244

Source: Reddit via @TUM_APISAK




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