B300 SXM6 AC vs Radeon Instinct MI455X
Contents
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) | Blackwell Ultra (2025) |
| GPU code name | MI450 256CU | GB110 |
| Market segment | Workstation | Workstation |
| Release date | 23 July 2026 (less than a year ago) | 11 September 2025 (1 year ago) |
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 | 18944 |
| Core clock speed | 1000 MHz | 1665 MHz |
| Boost clock speed | 2400 MHz | 2032 MHz |
| Number of transistors | 320,000 million | 208,000 million |
| Manufacturing process technology | 2 nm | 5 nm |
| Power consumption (TDP) | 2300 Watt | 1100 Watt |
| Texture fill rate | 2,457.6 | 1,202.9 |
| Floating-point processing power | 157.3 TFLOPS | 76.99 TFLOPS |
| ROPs | no data | 24 |
| TMUs | 1024 | 592 |
| Tensor Cores | no data | 592 |
| L1 Cache | 8 MB | 37 MB |
| L2 Cache | 192 MB | 126 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 | HBM3e |
| Maximum RAM amount | 432 GB | 288 GB |
| Memory bus width | 24576 Bit | 8192 Bit |
| Memory clock speed | 1900 MHz | 2000 MHz |
| Memory bandwidth | 23.3 TB/s | 8.19 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 | - | 10.3 |
| DLSS | - | + |
Pros & cons summary
| Recency | 23 July 2026 | 11 September 2025 |
| Maximum RAM amount | 432 GB | 288 GB |
| Chip lithography | 2 nm | 5 nm |
| Power consumption (TDP) | 2300 Watt | 1100 Watt |
Instinct MI455X has an age advantage of 10 months, a 50% higher maximum VRAM amount, and a 60% more advanced lithography process.
B300 SXM6 AC, on the other hand, has 52% lower power consumption.
We couldn't decide between Radeon Instinct MI455X and B300 SXM6 AC. We've got no test results to judge.
Other comparisons
We selected several comparisons of graphics cards with performance close to those reviewed, providing you with more options to consider.
