The past few months we have been intrigued by an AMD [1]GFX1250 target added to the LLVM codebase for the AMDGPU shader compiler back-end. GFX12 is RDNA4 and GFX1250 is presumably some "RDNA 4.5" / "RDNA Refresh" part akin to GFX1150 having been for the RDNA 3.5 parts with Strix Halo / Strix Point. The prior LLVM code confirmed GFX1250 is in APU form factor but product details beyond that have been scarce. Today a new AMD GFX1251 target was merged to LLVM.

AMD GFX1251 is now present in the LLVM codebase as a new sub-target similar to GFX1250. The features enabled by AMD GFX1251 are very similar to GFX1250 just as there were a number of different GFX115x variants. GFX1250 introduces a number of new instructions, [2]doubles the number of user SGPRs , and other improvements over GFX11 and GFX12.

The documentation patch confirms GFX1251 is an APU part just like GFX1250.

The AMD GFX1251 support was merged to LLVM Git today via [3]this commit . I'll keep monitoring for any more details on these unannounced revised RDNA4-based AMD APUs.



[1] https://www.phoronix.com/search/GFX1250

[2] https://www.phoronix.com/news/AMD-GFX1250-32-User-SGPRs

[3] https://github.com/llvm/llvm-project/commit/e556dc0b232b553d7894a22603d8ee46e78fbd99