Radeon Instinct MI455X vs 620
Contents
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | 918 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Power efficiency | 3.47 | no data |
| Architecture | GCN 3.0 (2014−2019) | CDNA 5.0 (2026) |
| GPU code name | Polaris 24 | MI450 256CU |
| Market segment | Laptop | Workstation |
| Release date | 13 May 2019 (7 years ago) | 23 July 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 | 384 | 32768 |
| Core clock speed | 730 MHz | 1000 MHz |
| Boost clock speed | 1024 MHz | 2400 MHz |
| Number of transistors | 1,550 million | 320,000 million |
| Manufacturing process technology | 28 nm | 2 nm |
| Power consumption (TDP) | 50 Watt | 1400 Watt |
| Texture fill rate | 24.58 | 2,457.6 |
| Floating-point processing power | 0.7864 TFLOPS | 157.3 TFLOPS |
| ROPs | 8 | no data |
| TMUs | 24 | 1024 |
| L1 Cache | 96 KB | 8 MB |
| L2 Cache | 128 KB | 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 3.0 x8 | PCIe 5.0 x16 |
| Width | no data | 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 | DDR3 | HBM4 |
| Maximum RAM amount | 2 GB | 432 GB |
| Memory bus width | 64 Bit | 24576 Bit |
| Memory clock speed | 900 MHz | 1900 MHz |
| Memory bandwidth | 14.4 GB/s | 23.3 TB/s |
| Shared memory | - | - |
| 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 | 12 (12_0) | N/A |
| Shader Model | 6.3 | N/A |
| OpenGL | 4.6 | N/A |
| OpenCL | 2.0 | 3.0 |
| Vulkan | 1.2.131 | N/A |
Pros & cons summary
| Recency | 13 May 2019 | 23 July 2026 |
| Maximum RAM amount | 2 GB | 432 GB |
| Chip lithography | 28 nm | 2 nm |
| Power consumption (TDP) | 50 Watt | 1400 Watt |
Radeon 620 has 2700% lower power consumption.
Instinct MI455X, on the other hand, has an age advantage of 7 years, a 21500% higher maximum VRAM amount, and a 1300% more advanced lithography process.
We couldn't decide between Radeon 620 and Radeon Instinct MI455X. We've got no test results to judge.
Be aware that Radeon 620 is a notebook graphics card while Radeon Instinct MI455X is a workstation one.
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