Rubin GPU vs Radeon Instinct MI455X

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	CDNA 5.0 (2026)	Rubin (2026−2027)
GPU code name	MI450 256CU	GR100
Market segment	Workstation	Workstation
Release date	23 July 2026 (recently)	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	32768	28672
Core clock speed	1000 MHz	700 MHz
Boost clock speed	2400 MHz	2267 MHz
Number of transistors	320,000 million	336,000 million
Manufacturing process technology	2 nm	3 nm
Power consumption (TDP)	2300 Watt	2300 Watt
Texture fill rate	2,457.6	2,031.2
Floating-point processing power	157.3 TFLOPS	130 TFLOPS
ROPs	no data	24
TMUs	1024	896
Tensor Cores	no data	896
L1 Cache	8 MB	56 MB
L2 Cache	192 MB	128 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 6.0 x16	PCIe 6.0 x16
Width	EAM Module	SXM Module
Supplementary power connectors	None	no data

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	HBM4	HBM4
Maximum RAM amount	432 GB	288 GB
Memory bus width	24576 Bit	16384 Bit
Memory clock speed	1900 MHz	2695 MHz
Memory bandwidth	23.3 TB/s	22.1 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

No outputs

No outputs

API and SDK support

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

DirectX	N/A	N/A
Shader Model	N/A	N/A
OpenGL	N/A	N/A
OpenCL	3.0	3.0
Vulkan	N/A	N/A
CUDA	-	10.7
DLSS	-	+

Pros & cons summary

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Maximum RAM amount	432 GB	288 GB
Chip lithography	2 nm	3 nm