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AMD Navi 2x GPU Specs Allegedly Leaked: Navi 21, Navi 22 and Navi 23

The specifications of the entire Navi 2x lineup have been leaked. These include Navi 21 (Big Navi), Navi 22 (RX 5700 XT successor), and Navi 23 which will be the budget offering. Starting from the top, we have Navi 21 which will feature 80 CUs or 5,120 shaders as already reported with sixteen L2 cache tiles meaning a bus width of 256-bit. The raster backend (ROPs) count has been cut from eight in Navi 10 to four in Navi 21.

PropertyNavi 10Navi 14Navi 12Navi 21Navi 22Navi 23Navi 31
num_se2124224
num_cu_per_sh1012101010810
num_sh_per_se2222222
num_rb_per_se8884444
num_tccs168161612816
num_gprs1024102410241024102410241024
num_max_gs_thds32323232323232
gs_table_depth32323232323232
gsprim_buff_depth1792179217921792179217921792
parameter_cache_depth1024102410241024102410241024
double_offchip_lds_buffer1111111
wave_size32323232323232
max_waves_per_simd20202016161616
max_scratch_slots_per_cu32323232323232
lds_size64646464646464
num_sc_per_sh1111111
num_packer_per_sc2224444
num_gl2aN/AN/AN/A4224
unknown0N/AN/AN/A1010810
unknown1N/AN/AN/A1612816
unknown2N/AN/AN/A80403280
num_cus (computed)40244080403280
Source

The flagship Navi 21 will supposedly have a clock speed of up to 2.2GHz, resulting in a single-precision compute performance of 22.5 TFLOPs, nearly twice as much as the Xbox Series X. All this at just 238W. It is still lower than the 29.8 TFLOPs rating of the RTX 3080, but the latter does consume more more than 350W under load (100W more). Regardless, I wouldn’t put too much faith in these figures as they primarily represent the performance in purely compute oriented workloads. This GPU will supposedly have a VRAM of 16GB. By all calculations, this would mean that Big Navi will sit between the RTX 3070 and the 3080, with the 20GB variant of the latter further cementing its position. Howevber, it should still be a capable 4K graphics card.

Then we have Navi 22 which will likely succeed the Radeon RX 5700 XT with the same CU count of 40. However, it looks like it’ll either have a lower L2 cache size or a reduced bus width of 192-bit or both. As per data from other outlets, this GPU may reach boost clocks as high as 2.5GHz. However, I seriously doubt that as you’d need water-based cooling to keep such as GPU from throttling. That is especially true since the 7nm node from TSMC is quite dense, and that this part has a max TDP of 170W. Navi 22 has a rated SP performance of 12.8 TFLOPs, just above the XSX. While many of my fellow journalists claim that this GPU should be enough for gaming, I wouldn’t recommend it for anything higher than QHD.

RX 5700

Lastly, there’s the Navi 23 GPU which will have 32 CUs or 2048 shaders. This will likely be the successor to the RX 5500 XT. There’s no info about the clock speeds and memory but I reckon it’ll feature a 128-bit bus and a boost clock close to 2GHz.

There’s also a Navi 31 GPU which looks identical to Navi 21. You may think that it’s a next-gen GPU but there’s a good chance that it’s either an OEM exclusive product or a professional PRO series graphics card.

PropertyRenoirCezanneVan GoghRembrandt
num_se1111
num_cu_per_sh8886
num_sh_per_se1112
num_rb_per_se2224
num_tccs4444
num_gprs25625610241024
num_max_gs_thds32323232
gs_table_depth32323232
gsprim_buff_depth1792179217921792
parameter_cache_depth10241024512256
double_offchip_lds_buffer1111
wave_size64643232
max_waves_per_simd10101616
max_scratch_slots_per_cu32323232
lds_size64646464
num_sc_per_shN/A111
num_packer_per_scN/A224
num_gl2aN/AN/A44
unknown0N/AN/A86
unknown1N/AN/A44
unknown2N/AN/A812
num_cus (computed)88812

The specs for the next 3-4 generations of APUs are also present. From a quick look, you can see that the CU count is going to stay unchanged with a max figure of 8. As we move from GCN to RDNA in VG, the wave config reduces from 64 to 32. but the max waves fetched per SIMD grows from 10 to 16, but the overall cache size seems to have been reduced going from Cezanne to VG and then again to Rembrandt.

Furthermore, the compute unit count in Rembrandt has been increased from eight to 16, thanks to an increase in the number of CUs per shader array. Overall, it looks like AMD will depend on the clock speed gains till Cezanne, then leverage the RDNA design to boost GPU performance with VG. Finally, Rembrandt will increase the execution units to significantly improve overall throughput.

Areej

Computer Engineering dropout (3 years), writer, journalist, and amateur poet. I started Techquila while in college to address my hardware passion. Although largely successful, it suffered from many internal weaknesses. Left and now working on Hardware Times, a site purely dedicated to. Processor architectures and in-depth benchmarks. That's what we do here at Hardware Times!

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