AMD Instinct MI430X OAM vs AMD Instinct MI455X

The Instinct MI430X is the newer part: CDNA 5, launched in 2027, against the Instinct MI455X's CDNA 5 from 2026. Newer architectures typically add lower-precision formats and better throughput per watt, so check the precision rows your workload actually uses.

Dense throughput for the Instinct MI430X against the Instinct MI455X: FP64 288 vs 5 TFLOPS. Sparse figures, where the vendor publishes them, appear under each dense number in the performance table.

Memory is 432 GB against 432 GB, fed at 23.3 TB/s versus 23.3 TB/s. More memory per GPU means larger models fit before you have to shard across cards, which often matters more than raw TFLOPS for inference.

For LLM training and inference, weight the FP8 and FP16 rows and memory capacity most heavily. For scientific and HPC workloads, the FP64 row is the one to read.