Radeon Instinct MI455X vs GB10

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	Blackwell 2.0 (2025−2026)	CDNA 5.0 (2026)
GPU code name	GB20B	MI450 256CU
Market segment	Workstation	Workstation
Release date	15 October 2025 (less than a year ago)	23 July 2026 (recently)
Launch price (MSRP)	$3,999	no data

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	6144	32768
Core clock speed	1665 MHz	1000 MHz
Boost clock speed	2418 MHz	2400 MHz
Number of transistors	no data	320,000 million
Manufacturing process technology	5 nm	2 nm
Power consumption (TDP)	140 Watt	1400 Watt
Texture fill rate	928.5	2,457.6
Floating-point processing power	29.71 TFLOPS	157.3 TFLOPS
ROPs	48	no data
TMUs	384	1024
Tensor Cores	384	no data
Ray Tracing Cores	48	no data
L1 Cache	6 MB	8 MB
L2 Cache	50 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 5.0 x16	PCIe 5.0 x16
Length	150 mm	no data
Width	IGP	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	LPDDR5X	HBM4
Maximum RAM amount	128 GB	432 GB
Memory bus width	256 Bit	24576 Bit
Memory clock speed	1067 MHz	1900 MHz
Memory bandwidth	273.2 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	No outputs
HDMI	+	-

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	12.1	-
DLSS	+	-

Pros & cons summary

---

Recency	15 October 2025	23 July 2026
Maximum RAM amount	128 GB	432 GB
Chip lithography	5 nm	2 nm
Power consumption (TDP)	140 Watt	1400 Watt