Scrying the AMD GFX1250 LLVM Tea Leaves

In just a few short days, AMD will be showing off their brand new MI400 series of Datacenter Accelerators at their Advancing AI event but before that event comes, we thought it would be fun to attempt to scry the tea leaves that are LLVM commits to see what we can ascertain about this next generation of AMD accelerator.LLVM currently has preliminary support for two new accelerators from AMD, under the codenames GFX1250 and GFX1251.GFX1250 is an accelerator chip oriented at the machine learning market called MI455X and will be what powers the Helios rack. While the GFX1251 is oriented at the HPC market, named the MI430X and is projected by AMD to deliver over 200 TFLOPs of native double-precision compute.We’ll focus on the GFX1250 for now though and save the GFX1251 for another day.We’ll compare the architecture to the consumer variant, the previous generation of CDNA accelerators, and to some extent Nvidia’s Blackwell.A curious note here is that while we know that these accelerators…