AMD cancelled high-end Navi4 GPU could have featured nine Shader Engines and over 200 Compute Units

A render of the rumored Navi 4 GPU, Source: creper9000

A few months ago, leaks on RDNA4 GPUs started hitting the web, indicating that the most powerful variant, known as Navi 4C, would feature a multi-chiplet layout of nine compute chiplets. This rumor is now finding confirmation within the source code for said processor, discovered by Kepler_L2 through some data mining, supposedly.

Perhaps the most interesting detail is that the code lists nine Shader Engines (from 0 to 8), matching previous rumors exactly. This immediately tells us that AMD had very serious plans for the high-end Navi 4 design. Unfortunately, they all came to a halt with the decision to cancel the most powerful variant.

Navi 4X GPU with nine Shader Engines, Source: Kepler_L2

According to another user from the discussion, adroc_thurston , who’s familiar with the Navi 4X design, the GPU was meant to feature more than 200 Compute Units, without going into specifics. As a reminder, the Navi 31 GPU features up to 96 Compute Units, so the supposed RX 8900 XTX could have ended up twice as fast if the same core layout were used.

Of course, that’s just speculation at this point, as the GPU is now seemingly never going to be released. However, this means that AMD has very advanced plans for the next-gen GPU architecture. Chances are some of this design will be used for the successor, the Navi 5.

Alleged AMD Navi 4C, Source: Moore’s Law is Dead

The proposed high-end Navi 4X design based on Navi 4C would have featured anything from 13 to 20 chiplets in total, including three AIDs (Active Interposer Dies) and MID (Multimedia and I/O) dies.

Despite speculation about the cancellation of high-end Navi 4 GPUs appearing months ago, to this day, AMD has never commented on said rumors or confirmed that plans for the RX 8000 series are focusing on the mid-range segment.

Source: Kepler_L2 (AnandTech Forums) via Wccftech