AMD Prepares to Challenge NVIDIA’s AI Leadership with MI400 Accelerators “MI455X & MI430X” in 2026, Plus Upcoming MI500 for 2027

AMD is gearing up for a significant challenge in the AI accelerator market with its upcoming Instinct MI400 and MI500 series, positioning itself to compete with NVIDIA’s current dominance.

Unveiling the AMD MI400 Series: Variants and Features for 2027

At the Financial Analyst Day 2025, AMD showcased its upcoming MI400 and MI500 series AI GPU accelerators, emphasizing their role in the company’s long-term AI strategy. This annual launch cycle is designed to fortify AMD’s presence in AI as NVIDIA continues to lead in this sector.

AMD Instinct: Data Center GPU Architecture Roadmap with specifications for MI300 to MI500 series

Set to debut next year, the MI400 series promises several advancements:

Enhanced HBM4 Capacity & Bandwidth
Broader AI Format Support with Increased Throughput
Standardized Rack-Scale Networking (UALoE, UAL, UEC)

The MI400 series is touted to achieve 40 PFLOPS (FP4) and 20 PFLOPS (FP8), effectively doubling the computational throughput of the currently popular MI350 series.

Key specifications of AMD Instinct MI450 Series including '40 PF', '432 GB' HBM4 Memory, and '3.6 TB/s' bandwidth

Additionally, the MI400 series will leverage HBM4 memory technology, featuring a 50% increase in memory capacity from the previous 288 GB of HBM3e to a substantial 432 GB of HBM4. This upgrade results in an impressive memory bandwidth of 19.6 TB/s, significantly surpassing the MI350 series’s 8 TB/s. Each GPU in this series boasts a scale-out bandwidth of 300 GB/s, indicating a major leap forward for AMD’s next-generation Instinct lineup.

Comparison Chart: Rack-Scale Performance Leadership with MI450 Series against Nvidia Vera Rubin

When positioned against NVIDIA’s Vera Rubin, AMD’s Instinct MI400 GPUs showcase notable advantages:

1.5x Memory Capacity compared to competition
Equivalent Memory Bandwidth and FLOPs (FP4 / FP8)
1.5x Greater Scale-Out Bandwidth

AMD Instinct MI400 Series Portfolio showcasing MI455X for AI Training & Inference and MI430X for HPC

The MI400 series consists of two main models: the MI455X, targeted at scalable AI Training & Inference workloads, and the MI430X, designed for HPC and Sovereign AI tasks, complete with hardware-based FP64 capabilities, hybrid computing (CPU+GPU), and retaining the same HBM4 memory as its counterpart.

AMD Instinct: Data Center GPU Architecture Roadmap from MI300 to MI500 series

Looking ahead to 2027, AMD is scheduled to introduce the Instinct MI500 series, continuing its annual product refresh cycle. This strategy aims to deliver rapid advancements in datacenter AI technology, aligning with NVIDIA’s approach of providing standard and “Ultra”versions. The MI500 series is expected to significantly enhance compute, memory, and interconnect capabilities, further increasing AMD’s competitive edge in the AI landscape.

Comparison of AMD Instinct AI Accelerators

Accelerator Name	AMD Instinct MI500	AMD Instinct MI400	AMD Instinct MI350X	AMD Instinct MI325X	AMD Instinct MI300X	AMD Instinct MI250X
GPU Architecture	CDNA Next / UDNA	CDNA 5	CDNA 4	Aqua Vanjaram (CDNA 3)	Aqua Vanjaram (CDNA 3)	Aldebaran (CDNA 2)
GPU Process Node	TBD	TBD	3nm	5nm+6nm	5nm+6nm	6 nm
XCDs (Chiplets)	TBD	8 (MCM)	8 (MCM)	8 (MCM)	8 (MCM)	2 (MCM; 1 Per Die)
GPU Cores	TBD	TBD	16, 384	19, 456	19, 456	14, 080
GPU Clock Speed (Max)	TBD	TBD	2400 MHz	2100 MHz	2100 MHz	1700 MHz
INT8 Compute	TBD	TBD	5200 TOPS	2614 TOPS	2614 TOPS	383 TOPs
FP6/FP4 Matrix	TBD	40 PFLOPs	20 PFLOPs	N/A	N/A	N/A
FP8 Matrix	TBD	20 PFLOPs	5 PFLOPs	2.6 PFLOPs	2.6 PFLOPs	N/A
FP16 Matrix	TBD	10 PFLOPs	2.5 PFLOPs	1.3 PFLOPs	1.3 PFLOPs	383 TFLOPs
FP32 Vector	TBD	TBD	157.3 TFLOPs	163.4 TFLOPs	163.4 TFLOPs	95.7 TFLOPs
FP64 Vector	TBD	TBD	78.6 TFLOPs	81.7 TFLOPs	81.7 TFLOPs	47.9 TFLOPs
VRAM	TBD	432GB HBM4	288 GB HBM3e	256 GB HBM3e	192GB HBM3	128 GB HBM2e
Infinity Cache	TBD	TBD	256 MB	256 MB	256 MB	N/A
Memory Clock	TBD	19.6 TB/s	8.0 Gbps	5.9 Gbps	5.2 Gbps	3.2 Gbps
Memory Bus	TBD	TBD	8192-bit	8192-bit	8192-bit	8192-bit
Memory Bandwidth	TBD	TBD	8TB/s	6.0 TB/s	5.3 TB/s	3.2 TB/s
Form Factor	TBD	TBD	OAM	OAM	OAM	OAM
Cooling	TBD	TBD	Passive / Liquid	Passive Cooling	Passive Cooling	Passive Cooling
TDP (Max)	TBD	TBD	1400W (355X)	1000W	750W	560W