Radeon Instinct MI455X vs Instinct MI8

Primary details

GPU architecture, market segment, value for money and other general parameters compared.

Place in the ranking	not rated	not rated
Place by popularity	not in top-100	not in top-100
Architecture	GCN 3.0 (2014−2019)	CDNA 5.0 (2026)
GPU code name	Fiji	MI450 256CU
Market segment	Workstation	Workstation
Release date	12 December 2016 (9 years ago)	23 July 2026 (recently)

Detailed specifications

General parameters such as number of shaders, GPU core base clock and boost clock speeds, manufacturing process, texturing and calculation speed. Real power consumption of some graphics cards can well exceed their nominal TDP, especially if overclocked.

Pipelines / CUDA cores	4096	32768
Core clock speed	1000 MHz	1000 MHz
Boost clock speed	no data	2400 MHz
Number of transistors	8,900 million	320,000 million
Manufacturing process technology	28 nm	2 nm
Power consumption (TDP)	175 Watt	1400 Watt
Texture fill rate	256.0	2,457.6
Floating-point processing power	8.192 TFLOPS	157.3 TFLOPS
ROPs	64	no data
TMUs	256	1024
L1 Cache	1 MB	8 MB
L2 Cache	2 MB	192 MB

Form factor & compatibility

Information on compatibility with other computer components. Useful when choosing a future computer configuration or upgrading an existing one. For desktop graphics cards it's interface and bus (motherboard compatibility), additional power connectors (power supply compatibility).

Interface	PCIe 3.0 x16	PCIe 5.0 x16
Length	152 mm	no data
Width	2-slot	EAM Module
Supplementary power connectors	1x 8-pin	None

VRAM capacity and type

Parameters of VRAM installed: its type, size, bus, clock and resulting bandwidth. Integrated GPUs have no dedicated video RAM and use a shared part of system RAM.

Memory type	HBM	HBM4
Maximum RAM amount	4 GB	432 GB
Memory bus width	4096 Bit	24576 Bit
Memory clock speed	500 MHz	1900 MHz
Memory bandwidth	512.0 GB/s	23.3 TB/s

Connectivity and outputs

This section shows the types and number of video connectors on each GPU. The data applies specifically to desktop reference models (for example, NVIDIA’s Founders Edition). OEM partners often modify both the number and types of ports. On notebook GPUs, video‐output options are determined by the laptop’s design rather than the graphics chip itself.

Display Connectors

No outputs

No outputs

API and SDK support

List of supported 3D and general-purpose computing APIs, including their specific versions.

DirectX	12 (12_0)	N/A
Shader Model	6.3	N/A
OpenGL	4.6	N/A
OpenCL	2.0	3.0
Vulkan	1.2.131	N/A

Pros & cons summary

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Recency	12 December 2016	23 July 2026
Maximum RAM amount	4 GB	432 GB
Chip lithography	28 nm	2 nm
Power consumption (TDP)	175 Watt	1400 Watt