AMD Radeon Instinct MI455X: specs and benchmarks
Contents
Summary
AMD started Radeon Instinct MI455X sales 23 July 2026. This is a CDNA 5.0 architecture desktop card based on 2 nm manufacturing process and primarily aimed at designers. 432 GB of HBM4 memory clocked at 1.9 GHz are supplied, and together with 24576 Bit memory interface this creates a bandwidth of 23.3 TB/s.
Compatibility-wise, this is a eam module graphics card attached via PCIe 6.0 x16 interface. No additional power connector is required, and power consumption is at 2300 Watt.
Primary details
Some basic facts about Radeon Instinct MI455X: architecture, market segment, release date etc.
| Place in the ranking | not rated | |
| Place by popularity | not in top-100 | |
| Architecture | CDNA 5.0 (2026) | |
| GPU code name | MI450 256CU | |
| Market segment | Workstation | |
| Release date | 23 July 2026 (recently) |
Detailed specifications
Radeon Instinct MI455X's specs such as number of shaders, GPU base clock, manufacturing process, texturing and calculation speed. These parameters indirectly speak of Radeon Instinct MI455X's performance, but for precise assessment you have to consider its benchmark and gaming test results.
| Pipelines / CUDA cores | 32768 | of 57344 (Rubin Ultra GPU) |
| Core clock speed | 1000 MHz | of 2670 MHz (Arc B580) |
| Boost clock speed | 2400 MHz | of 3130 MHz (Radeon RX 9060 XT 16 GB) |
| Number of transistors | 320,000 million | of 670,000 million (Rubin Ultra GPU) |
| Manufacturing process technology | 2 nm | |
| Power consumption (TDP) | 2300 Watt | of 3600 Watt (Rubin Ultra GPU) |
| Texture fill rate | 2,457.6 | of 4,062.5 (Rubin Ultra GPU) |
| Floating-point processing power | 157.3 TFLOPS | of 260 (Rubin Ultra GPU) |
| TMUs | 1024 | of 1792 (Rubin Ultra GPU) |
| L1 Cache | 8 MB | of 112 MB (Rubin Ultra GPU) |
| L2 Cache | 192 MB | of 408 MB (Data Center GPU Max 1350) |
Form factor & compatibility
This section provides details about the physical dimensions of Radeon Instinct MI455X and its compatibility with other computer components. This information is useful when selecting a computer configuration or upgrading an existing one. For desktop graphics cards, it includes details about the interface and bus (for motherboard compatibility) and additional power connectors (for power supply compatibility).
| Interface | PCIe 6.0 x16 | |
| Width | EAM Module | |
| Supplementary power connectors | None |
VRAM capacity and type
Parameters of memory installed on Radeon Instinct MI455X: its type, size, bus, clock and resulting bandwidth. Note that GPUs integrated into processors have no dedicated memory and use a shared part of system RAM instead.
| Memory type | HBM4 | |
| Maximum RAM amount | 432 GB | of 432 GB (Radeon Instinct MI455X) |
| Memory bus width | 24576 Bit | of 32768 Bit (Rubin Ultra GPU) |
| Memory clock speed | 1900 MHz | of 16000 GB/s (GeForce RTX 4050 Mobile) |
| Memory bandwidth | 23.3 TB/s | of 3,277 GB/s (Radeon Instinct MI250X) |
| Resizable BAR | + |
Connectivity and outputs
Types and number of video connectors present on Radeon Instinct MI455X. As a rule, this section is relevant only for desktop reference graphics cards, since for notebook ones the availability of certain video outputs depends on the laptop model, while non-reference desktop models can (though not necessarily will) bear a different set of video ports.
| Display Connectors | No outputs |
API and SDK support
APIs supported by Radeon Instinct MI455X, sometimes including their particular versions.
| DirectX | N/A | |
| Shader Model | N/A | |
| OpenGL | N/A | of 4.6 (GeForce RTX 5090 D) |
| OpenCL | 3.0 | |
| Vulkan | N/A |
NVIDIA equivalent
According to our data, the closest NVIDIA alternative to Radeon Instinct MI455X is RTX PRO 6000 Blackwell Server.
Similar GPUs
Here is our recommendation of several graphics cards that are more or less close in performance to the one reviewed.
