Generation Navi 3x consists of three GPUs: chiplet Navi 31, Navi 32 and monolithic Navi 33 (integrated variants from APU Phoenix a Phoenix 2 let’s leave it aside this time). However, the Radeon RX 7900 GRE still carries a special version Navi 31which (thanks to only a 256-bit bus) can use a case that has the same dimensions and is compatible with the same PCB as Navi 32. The cards are thus built on four basic variants of chips.
Core Navi 31 consists of a 5nm 300mm² central chiplet (GCD) and six 6nm 37mm² memory chiplets (MCD) integrating Infinity Cache and an interface for GDDR6 memories. A total of 522 mm² of silicon and 58 billion transistors. Trimmed variants (Radeon RX 7900 XT and Radeon RX 7900 GRE) have one to two MCDs less, so the functional silicon area is correspondingly lower (485 and 448 mm²).
from top left: Navi 33, Navi 32, Navi 31 256bit, Navi 31 384bit (PowerColor)
Core Navi 32 it stands on a 5nm 200mm² central chiplet (GCD) and four 6nm 37mm² memory chiplets (MCDs), the same as on Navi 31. That makes a total of 348 mm² of silicon and probably no more than 40 billion transistors (the exact figure was not disclosed). The Radeon RX 7700 (XT?) is expected to carry one MCD less, which means an area of 311mm².
Monolithic chip Navi 33 it uses a pure 6nm process and reaches an area of 204 mm² and consists of 13.3 billion transistors. Despite the fact that AMD did not manage to increase the clock frequencies of the Navi 3x chips compared to the previous generation, as the company expected, the Navi 33 achieves a remarkable power-to-transistor ratio, which is significantly higher than other current GPUs, be it AMD, Nvidia or Intel (compared to which is almost twice the power per transistor).
2023-08-11 08:05:00
#RDNA #generation #GPUs #photographed
