Flopper.io Flopper.io

AMD Instinct MI355X OAM vs AMD Instinct MI430X OAM

Side-by-side specifications, performance, and rental pricing for datacenter AI workloads.

Instinct MI355X: CDNA 4, 2025 Instinct MI430X: CDNA 5, 2027
Memory
288 vs 432 GB
144 GB more for the Instinct MI430X
Bandwidth
8.0 TB/s vs 23.3 TB/s
Instinct MI430X moves data faster
See rental pricing from $3.44/hr Download comparison sheet

Share this page

AMD Instinct MI355X OAM vs AMD Instinct MI430X OAM

A post with this link shows the card on the Image tab as its preview.

Post on X Share on LinkedIn
 Printable version →

AMD Instinct MI355X OAM

Full specs →

What is the AMD Instinct MI355X?

The Instinct MI355X is a GPU from AMD on the CDNA 4 architecture, an accelerator for AI training, inference and high-performance computing. It is an OAM module, the open accelerator format used in multi-GPU servers. Instinct MI355X full specifications →

Can I rent the Instinct MI355X in the cloud?

Yes. Cloud providers tracked by Flopper rent the Instinct MI355X by the hour, and the pricing page compares their current rates and the price history side by side. Instinct MI355X rental prices →

How does the Instinct MI355X compare with other accelerators?

This page sets the Instinct MI355X against the Instinct MI430X. The Instinct MI355X is the older generation of the two. Both are AMD parts, and both ship as an OAM module, so they fit the same class of system. The compare tool builds the same comparison for any two parts in the catalogue. All GPU comparisons →

Where do the Instinct MI355X figures come from?

Every Instinct MI355X figure on this page traces to AMD's own datasheet or specification table. How Flopper verifies specifications →

AMD Instinct MI430X OAM

Full specs →

What is the AMD Instinct MI430X?

The Instinct MI430X is a GPU from AMD on the CDNA 5 architecture, an accelerator for AI training, inference and high-performance computing. It is an OAM module, the open accelerator format used in multi-GPU servers. It has been announced but is not yet shipping. Instinct MI430X full specifications →

Can I rent the Instinct MI430X in the cloud?

Flopper is not tracking any live rental listings for the Instinct MI430X yet. The provider directory lists the clouds that rent comparable accelerators on demand. GPU cloud providers →

How does the Instinct MI430X compare with other accelerators?

This page sets the Instinct MI430X against the Instinct MI355X. The Instinct MI430X is the newer generation of the two. Both are AMD parts, and both ship as an OAM module, so they fit the same class of system. The compare tool builds the same comparison for any two parts in the catalogue. All GPU comparisons →

Where do the Instinct MI430X figures come from?

AMD published the Instinct MI430X figures in marketing material rather than a datasheet, and Flopper has no independent confirmation of them. How Flopper verifies specifications →

Specifications

Instinct MI355X
Instinct MI430X
Architecture
CDNA 4CDNA 5
Launch Year
20252027
Form Factor
OAMOAM
Memory
288 GB432 GB
Memory Bandwidth
8.0 TB/s23.3 TB/s
TDP
1.4 kW—
Process Node
3nm/6nm—

Performance (TFLOPS)

Instinct MI355X
Instinct MI430X
79 TFLOPS 288 TFLOPS
157 TFLOPS No verified data available
No verified data available No verified data available
2,517 TFLOPS
5,033 TFLOPS sparse
 No verified data available
2,517 TFLOPS
5,033 TFLOPS sparse
 No verified data available
5,033 TFLOPS
10,066 TFLOPS sparse
 No verified data available
FP6
10,066 TFLOPS
sparse not published
 No verified data available
10,066 TFLOPS
sparse not published
9,200 TFLOPS
5,033 TOPS
10,066 TOPS sparse
 No verified data available

Figures are dense. Where a vendor publishes a figure it sits under the dense one and never decides a winner. Hover any precision for its definition, or read the GPU glossary.

FLOPS by Precision

What actually differs

The Instinct MI430X is the newer part: CDNA 5 (2027) against the Instinct MI355X's CDNA 4 (2025).

The Instinct MI430X carries 144 GB more memory (432 GB against 288 GB), so larger models fit on one GPU before you shard. Bandwidth is 8.0 TB/s against 23.3 TB/s, which sets the ceiling on decode speed.

Weight the FP8 and FP16 rows for LLM work and the FP64 row for HPC.

New to the terms? The glossary explains FP64, FP32, BF16, FP16, FP8, FP4, INT8, Sparsity and TFLOPS.

Frequently asked questions

Which should you choose, the Instinct MI355X or the Instinct MI430X?

Choose the Instinct MI430X when the model has to fit on one GPU: it carries 144 GB more memory.

Which has more memory, the Instinct MI355X or the Instinct MI430X?

The Instinct MI430X carries 432 GB of memory versus 288 GB for the Instinct MI355X. Memory bandwidth is 8.0 TB/s for the Instinct MI355X and 23.3 TB/s for the Instinct MI430X.

How much do the Instinct MI355X and the Instinct MI430X cost to rent?

Live cloud listings tracked by Flopper price the Instinct MI355X from $3.44 per GPU-hour across 1 provider, and no live listings yet for the Instinct MI430X. The rental section on this page links to every provider, rate and the price history for each GPU.

Where to Rent

AMD Instinct MI355X OAM

Rent from

$3.44 / GPU-hr

Lowest of 2 live listings across 1 provider

See all Instinct MI355X rental prices →

Price history and every provider on the pricing page. Some links are affiliate links.

AMD Instinct MI430X OAM

No live rental listings tracked for the Instinct MI430X yet.

Browse GPU cloud providers

Get Comparison Updates

New GPUs added weekly. Be the first to see how they compare.

Open in Full Compare Tool → Instinct MI355X full specs Instinct MI430X full specs Estimate cluster cost in the calculator →

© 2026 Flopper.io - Compare the GPUs Powering AI