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AMD Navi 21 to Feature 80 Compute Units (CU)

With Navi 22 – 40 CUs and Navi 23 – 32 CUs.

Lots of rumors and leaks about AMD’s up-coming Big Navi and its siblings … can’t wait to see how it will compare to Nvidia’s RTX 20 series (notice I didn’t mention RTX 30 series – D@mmit I just did lol!)

Taken from Videocardz … The speciations of the Navi 21 and Navi 22 were already ‘confirmed’ by AMD through ROCm 3.8 software update earlier. The data was pieced together by a Redditor stblr. It seems that the same user now has an update featuring Navi 23 and upcoming APUs.

The data provides the most basic speciations for upcoming GPUs and APUs such as Compute Unit count, boosts clocks, and power targets. The values were extracted from macOS 1 1 beta already containing the firmware for the ‘AMDRadeonX6000’ series.

Judging from the frequency listed in the data, we can guess that these correspond to the Radeon Pro series. For instance, the freq_table_gfx[1] (MHz) of Navi 10 is 1400 MHz, similar to Radeon Pro 5700 with a boost clock of 1350 MHz. As we know  Radeon RX 5700 XT has a boost clock of 1755 MHz, so what this means it the clock speeds could be even higher. For Navi 23 and Navi 31, the frequencies and power limits are still missing.

Navi 21 – Sienna Cichlid – Big Navi

This GPU would allegedly feature up to 80 Compute Units (5120 Stream Processors if each CU has 64 cores). The variant listed in macOS11  appears to have a boost clock at 2050 MHz with Navi 21A variant and up to 2200 MHz with Navi 21B variant.

With a boost clock of 2200 MHz, the Navi 21B would have a shader performance of 22.5 TFLOPs. For comparison, with NVIDIA’s new dual SM architecture, the GeForce RTX 3080 graphics card has a maximum FP32 throughput of 29.8 TFLOPs.

Navi 22 – Navy Flounder

The mid-tier GPU in a lineup appears to feature 40 CUs, so just as many as Navi 10. Therefore, the GPU is expected to be an RDNA2 version of mid-range graphics for the upcoming RX 6700 series. The GPU is listed with a (maximum) GPU clock of 2500 MHz, so even higher than Navi 21.

Navi 23 – Dimgrey Cavefish

The entry-level GPU called Navi 23 is also listed in the firmware.  Judging from the data collected by the Reddit stblr, we can conclude that the full number of CUs is 32 (so around 2048 Stream Processors). The frequency charts are not featured in the firmware yet.

Source: Videocardz , stblr @ Reddit


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