More leaks: AMD Navi 2x and Navi 31 GPU spec details found in latest macOS 11 beta code
Redditor “stblr” recently posted a compiled spec sheet with details on the upcoming AMD Navi 2x plus the Navi 31 GPUs found in the source code of the latest macOS 11 beta version. This spec compilation confirms most of the rumors regarding CU counts, and it also sheds some light on what we can expect in terms of core clocks and TGPs. Keep in mind that this info could still be somewhat outdated, since the Apple code is still in beta state. Additionally, it looks like these models may be part of the Radeon Pro family that is usually featured in Apple’s workstations, and the “regular” GPUs sold separately could feature higher clocks.
The flagship Navi 21 GPUs (codename Sienna Cichlid) are now confirmed to feature 80 CUs (most likely 5120 stream processors if AMD is keeping the same 64 core per unit specs from last year). Interestingly enough, the macOS 11 code lists two versions for the Navi flagships, indicating that AMD could indeed plan to launch GDDR6 and HBM2 variants. The Navi 21A version comes with 2050 MHz boost clocks and a 200 W TGP, while the Navi 21B variant gets 2200 MHz boost clocks and 238 W TGP.
Next up is the Navi 22 mid-range GPU recently revealed to be codenamed Navy Flounder. This one features 40 CUs, but the core clocks can boost to 2500 MHz and the TGP is set to 170 W.
Specs for the entry-level Navi 23 codenamed Dimgrey Cavefish are not that detailed. CU count is set to 32, but the core clocks and TGP specs are not provided. Twitter commenters pointed out that this could be a custom GPU optimized for Apple’s upcoming MacBooks.
As for the Navi 31, specs seem to be identical to the Navi 21 GPU. However, we already know that the Navi 31 models will feature the improved RDNA3 architecture and the macOS 11 specs may only be placeholder info due to insufficient data for GPUs that may launch at least one year from now.