AMD Instinct MI455X
- GPU Brand:
- AMD
- Series:
- Instinct MI400 Series
- Tier:
- Datacenter
- Board Partner:
- AMD (Reference)
- VRAM:
- 432 GB
- Memory Type:
- HBM4
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Manufacturer: AMD Last updated: October 9, 2026
AMD Instinct MI455X Review
AMD Instinct MI455X graphics card, 432 GB VRAM.
The AMD Instinct MI455X is an AMD reference-design graphics card in the Instinct MI400 Series lineup, launched 7/23/2026. It ships with 432 GB of HBM4. This entry reflects AMD's official reference specification; board-partner card variants may differ in clocks, cooling, and power delivery.
Performance and Architecture
The AMD Instinct MI455X is an AMD reference-design graphics card in the Instinct MI400 Series lineup, launched 7/23/2026. It ships with 432 GB of HBM4. This entry reflects AMD's official reference specification; board-partner card variants may differ in clocks, cooling, and power delivery.
Platform and Connectivity
The AMD Instinct MI455X follows AMD's Instinct reference design conventions for memory, display outputs, and bus interface as specified by AMD.
Comparison to Alternatives
Within this catalog's Instinct MI400 Series listings, the AMD Instinct MI455X reference specification sits alongside board-partner variants of the same chip, which may offer different clocks, cooling, and pricing.
Our verdict
Reviewed by Burooj Alam. Rated by us, not by users.
Best for
- Buyers comparing AMD's official reference specifications
- Researching a chip before choosing a board-partner card
- Workstation/datacenter procurement research
Not for
- Buyers wanting a specific retail card with cooler and warranty details
- Overclocking-focused enthusiasts (reference clocks only)
Specifications
What these specs meanPlatform
| GPU Brand | AMD |
|---|---|
| Board Partner | AMD (Reference) |
Identity and type
| Product Type | Datacenter Accelerator |
|---|---|
| Series | Instinct MI400 Series |
Performance
| Memory Type | HBM3E |
|---|
Silicon
| Architecture | CDNA4 |
|---|---|
| Process Node | TSMC 2nm | 3nm FinFET |
Memory
| Memory Bandwidth | 23300 GB/s |
|---|
Physical and cooling
| Cooling Type | Direct Liquid Cooling (DLC) |
|---|
Market and workstation
| Launch Date | 2026 |
|---|---|
| ECC Memory | Yes |
FAQs
What are the key specifications of the AMD Instinct MI455X?
Key specs for the AMD Instinct MI455X: Memory Bandwidth 23300 GB/s, Form Factor Enhanced Accelerator Module (EAM), Product Type Datacenter Accelerator, Architecture CDNA4, Lithography TSMC 2nm | 3nm FinFET, Peak Engine Clock 2400 MHz.
Who is the AMD Instinct MI455X best suited to?
Best suited to: Buyers comparing AMD's official reference specifications; Researching a chip before choosing a board-partner card; Workstation/datacenter procurement research.
What are the drawbacks of the AMD Instinct MI455X?
Not the best fit for: Buyers wanting a specific retail card with cooler and warranty details; Overclocking-focused enthusiasts (reference clocks only).