AMD Instinct MI300 GPU to feature 4 graphics chiplets

Published: Sep 7th 2021, 13:25 GMT   Comments

Please note that this post is tagged as a rumor.

AMD Instinct MI300 GPU with four chiplets

While AMD Aldebaran GPU is not officially launched yet, there are first leaks on its successor. 

Just recently there was a leak revealing the configuration of the MI200 graphics processor. The leaks from the ROCm software update suggest that the accelerator offers 110 Compute Units. What isn’t quite clear is whether this configuration refers to the whole card or just a single graphics chiplet.

Coelacanth’s Dream has a lengthy post (in Japanese) on the subject. It’s speculated whether the GPU ID string of GFX90A_110 describes the configuration of the full MI200 accelerator or just one chiplet, which means either 220 CUs (2x 110) or 110 CUs (2x 55).

While the speculation on MI200 accelerator continues, @Kepler_L2 reaffirms previous rumors that MI300 will feature twice as many GPU dies as MI200. What this means is that the future of AMD accelerators based on CDNA architectures is going to continue using MCM design with an increasing number of GCD (Graphics Complex Die) or graphics tiles/chiplets.

The codename of MI300’s GPU is not known yet, but it is likely going to adopt a name after another giant star, such as Rigel or Antares.

The MI300 is likely to set to compete with next-gen Intel and NVIDIA accelerators, which are based on Ponte Vecchio GPU (Xe-HPC architecture) or NVIDIA H100 compute card based on Hopper GH100 GPU.

AMD Instinct Accelerators
Accelerator NameAMD Radeon Instinct MI60AMD Instinct MI100AMD Instinct MI200AMD Instinct MI300
Architecture7nm GCN5 (GFX906)7nm CDNA1 (GFX908)CDNA2 (GFX90A)CDNA3 (?)
GPUVega 20ArcturusAldebaran (MCM)? (MCM)
Compute Tiles1124
Compute Units64 (64)1202x 110 or 2x 554x (?)
FP32 Cores (Full GPU)4096 (4096)7680 (8192)TBC4x (?)
GPU Clock Speed1800 MHz~1500 MHzTBCTBC
Memory Clock1000 MHz1200 MHzTBCTBC
Memory Bus4096-bit4096-bitTBCTBC
Memory Bandwidth1 TB/s1.23 TB/sTBCTBC
Form FactorDual Slot, Full LengthDual Slot, Full LengthOAMTBC
CoolingPassive CoolingPassive CoolingTBCTBC

Source: @Kepler_L2

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