AMD ROCm Software update confirms Navi 32 GPU has 60 Compute Units

AMD ‘confirms’ Navi 32 with 60 Compute Units, Navi 33 has 32

The rumor from Angstronomics on possible lower core count for Navi 32 GPU has now been indirectly confirmed by AMD. 

AMD Navi 31 (RDNA3) GPU for Radeon RX 7900 Series, Source: AMD

The site alleged that Navi 32 GPU has 30 Workgroup processors instead of the previously rumored 32. This means that the CU (Compute Unit) count is not 64 but 60. Exactly this number is now mentioned by AMD developers for ROCm software in a file called “performance.hpp” published 2 days ago.

ROCm Software Platform, Source: AMD/Github

Furthermore, the same core refers to Navi 33 GPU with CU count of 32, which matches previous rumors as well. Given what we already know about RDNA3 architecture, this means that full Navi 32 GPU offers 3840 Stream processors while Navi 33 has 2048 respectively.

Not much has changed since August leaks, the rumored specs, especially from Angstronomics have been very accurate. The only change that we had to implement to our spec chart is higher memory speed (from rumored 18 Gbps to 20 Gbps) and PCIe Gen4 support instead of Gen5.

A bigger question is where will Navi 32 and 33 actually land in terms of Radeon SKUs. The Radeon RX 7900 desktop series appear to be exclusively based on Navi 31 GPU, while Navi 32 may very well be launched as Radeon RX 7800 desktop GPUs and possibly as laptop RX 7900M GPU.

Therefore, it is expected that AMD will talk more about Navi 32 GPU at CES 2023 in January. At the event the company very likely to reveal its Radeon RX 7000M series alongside new Ryzen 7000 laptop.

Codename “Plum Bonito” “Wheat Nas” “Hotpink Bonefish”
Fabrication Node TSMC N5/N6 TSMC N5/N6 TSMC N5/N6
GPU Package Multi-Chip-Module (MCM) Multi-Chip-Module (MCM) Monolithic
Chiplet Configuration 1x GCD + 6x MCD 1x GCD + 4x MCD
Transistors 58B TBC TBC
GCD Size 300 mm² ~200 mm²
MCD 6x ~37 mm² 4x ~37 mm²
Full GPU 522 mm² ~348 mm² ~203 mm²
Shader Engines 6 3 2
Shader Arrays 12 6 4
RDNA Workgroups (WGP) 48 30 16
Compute Units 96 60 32
Stream Processors  6144 3840 2048
FP32 Cores 12288 7680 4096
Memory & Bus GDDR6 384-bit GDDR6 256-bit GDDR6 128-bit
Memory Bandwidth 960 GB/s (20 Gbps) 640 GB/s (20Gbps) 320 GB/s (20Gbps)
 Infinity Cache 96 MB 64 MB 32 MB
PCIe Interface PCIe Gen4 PCIe Gen4 PCIe Gen4
Release December 2023 TBC TBC
Series Radeon RX 7900 desktop Radeon RX 7800 desktop
Radeon RX 7900 mobile
Radeon RX 7600 desktop
Radeon RX 7700 mobile

Source: Github (ROCmSoftwarePlatform) via @Kepler_L2