Although AMD revealed its RDNA 3 architecture in June, the chipmaker refused to share any specifications regarding the next-generation graphics cards. However, Angstronomics (opens in new tab) has shared new information about AMD's newest Navi 3x silicon. The new outlet claims that the specifications were finalized in 2020 and no changes have been made since. Nonetheless, treat the information with some caution.
Angstronomics details three Navi 3x silicon: Navi 31, Navi 32, and Navi 33. Starting from the largest to the smallest, Navi 31 is the flagship silicon and touted as the world's first GPU with a chiplet design. Navi 31, which carries the GFX1100 ID (codename Plum Bonito), reportedly features one Graphics Chiplet Die (GCD) with six accompanying Memory Chiplet Dies (MCD).
The GCD, which approximately measures 308 mm², features TSMC's 5nm process node. It houses up to 48 Workgroup Processors (WGPs). If we break that down, each WGP has two compute units (CUs), meaning that Navi 31 die sports 96 CUs or 12,288 ALUs. On the other hand, the MCD is around 37.5 mm² in size and made with TSMC's 6nm manufacturing process. Each MCD has 16MB of AMD's Infinity Cache so Navi 31-powered graphics card will rock up to 96MB of Infinity Cache. It's admittedly smaller than Navi 21, which has 128MB of Infinitty Cache.
Navi 32, aka GFX1101 (codename Wheat Nas) is the smaller version of Navi 31, targeting both mobile and desktop segments. The GCD and MCD measure 200 mm² and 37.5 mm², respectively. The GCD only has 30 WGP, which totals up to 60 CUs (7,680 ALUs). The Navi 32 only has four MCD, limiting the Infinity Cache to 64MB.
On the contrary, Navi 33, GFX1102 (Hotpink Bonefish) sticks to a monolithic design. AMD's priority is to push Navi 33 on mobile, especially inside AMD Advantage laptops. It has 16 WGPs, which equals to 32 CUs (4,096 ALUs). Navi 33 boasts drop-in compatibility with Navi 23 PCBs, facilitating adoption among vendors. It has 32MB of Infinity Cache and a 128-bit memory interface. According to Angstronomics, Navi 33 outpeforms Intel's Arc Alchemist and commands only half the cost of production while also being more power efficient.
