Please note that this post is tagged as a rumor.
A story with a twist
AMD Navy Flounder and Sienna Cichlid are both GFX1030
This is an interesting twist to our AMD’s ‘meaningless codenames’ coverage. AMD is slowly pushing its Linux patches for the upcoming RDNA2 GPUs, namely Navi 21, Navi 22 and Navi 23. Obviously the focus is currently on the Navi 21, which is expected to be the long-awaited Big Navi.
On Monday we reported that AMD is adding patches for Unified and Graphics Memory Controllers for Sienna Cichlid. The code also included references to HBM memory, although the code did not specifically call these values. Yet, it was added at the same time and only alongside the code for this very new GPU. Naturally, we assumed that HBM memory could be used on Big Navi.
Earlier, we covered a story about Navy Flounder. This is a new codename for yet unreleased RDNA2 GPU, but the code did not explicitly mention any name. Only by following the data it was determined that the GPU *should be* Navi 22. Both Navy Flounder and Sienna Cichlid are using the same ID of GFX1030, as revealed by the latest update to Mesa (open-source OpenGL/Vulkan implementation for Linux).
Navy Flounder and Sienna Cichlid using GFX1030 ID, Source: Freedesktop
It is not really common for AMD to use the same ID for two different GPUs, in fact, even the Navi 12 had a different ID than Navi 10, despite essentially being a variant with HBM (as shown above).
Historically speaking, only some GPUs from the same generation shared the GFX level. The most recent being: Fiji, Polaris10, and Polaris 11 (GFX803). Both Vega and Navi have IDs for each GPUs. Since we already know IDs for Navi 22 (1032) and Navi 23 (1033), Navy Flounder could either be a variant of Sienna Cichlid or a completely different GPU.
|AMD Graphics Chips|
|Graphics Architecture||GPU Codename||Alternative Name||Architecture||Product|
|GFX900||VEGA 10||GCN 5.0||RX VEGA / Radeon Pro|
|GFX902||RAVEN||Raven Ridge / Picasso||GCN 5.0||Ryzen 2000/3000(G/GE)|
|GFX904||VEGA 12||GCN 5.0||Vega Pro 20 (MAC)|
|GFX906||VEGA 20||GCN 5.0||Radeon VII / Radeon Pro VII|
|GFX908||ARCTURUS||CDNA 1.0||Instinct MI100 TBC|
|GFX909||RENOIR||GCN 5.0||Ryzen 4000(H/U/G)|
|GFX1010||NAVI 10||RDNA 1.0||RX 5700/5600(M/XT)|
|GFX1011||NAVI 12||RDNA 1.0||PRO 5600M (MAC)|
|GFX1012||NAVI 14||RDNA 1.0||RX 5500 (M/XT)|
|GFX1030||NAVI 21||Sienna Cichlid||RDNA 2.0||Big Navi + HBM ? TBC|
|GFX1030||NAVI 2x||Navy Flounder||RDNA 2.0||TBC|
|GFX1031||NAVI 22||RDNA 2.0||PRO 6600 (MAC) TBC|
|GFX1032||NAVI 23||RDNA 2.0||RX 6500 TBC|
|GFX1033||VAN GOGH||RDNA 2.0||TBC|
|GFX1040||VAN GOGH LITE||RDNA 2.0||TBC|
Source: Mesa update on Freedesktop