Radeon Instinct MI455X vs Pro W6900X

Primary details

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

Place in the ranking	106	not rated
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	3.37	no data
Power efficiency	10.78	no data
Architecture	RDNA 2.0 (2020−2025)	CDNA 5.0 (2026)
GPU code name	Navi 21	MI450 256CU
Market segment	Workstation	Workstation
Release date	3 August 2021 (4 years ago)	23 July 2026 (recently)
Launch price (MSRP)	$4,999	no data

Cost-effectiveness evaluation

The higher the ratio, the better. We use the manufacturer's recommended prices.

Performance to price scatter graph

Currently popular graphics cards are shown for comparison.

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	5120	32768
Core clock speed	1825 MHz	1000 MHz
Boost clock speed	2150 MHz	2400 MHz
Number of transistors	26,800 million	320,000 million
Manufacturing process technology	7 nm	2 nm
Power consumption (TDP)	300 Watt	1400 Watt
Texture fill rate	688.0	2,457.6
Floating-point processing power	22.02 TFLOPS	157.3 TFLOPS
ROPs	128	no data
TMUs	320	1024
Ray Tracing Cores	80	no data
L0 Cache	1.3 MB	no data
L1 Cache	1 MB	8 MB
L2 Cache	4 MB	192 MB
L3 Cache	128 MB	no data

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 4.0 x16	PCIe 5.0 x16
Length	267 mm	no data
Width	Quad-slot	EAM Module
Supplementary power connectors	None	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	GDDR6	HBM4
Maximum RAM amount	32 GB	432 GB
Memory bus width	256 Bit	24576 Bit
Memory clock speed	2000 MHz	1900 MHz
Memory bandwidth	512.0 GB/s	23.3 TB/s
Resizable BAR	+	+

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	1x HDMI, 4x Thunderbolt	No outputs
HDMI	+	-

API and SDK support

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

DirectX	12 Ultimate (12_2)	N/A
Shader Model	6.5	N/A
OpenGL	4.6	N/A
OpenCL	2.1	3.0
Vulkan	1.2	N/A

Pros & cons summary

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Recency	3 August 2021	23 July 2026
Maximum RAM amount	32 GB	432 GB
Chip lithography	7 nm	2 nm
Power consumption (TDP)	300 Watt	1400 Watt