Radeon RX 6900 vs HD 6645G2
Contents
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | not rated | 34 |
| Place by popularity | not in top-100 | not in top-100 |
| Power efficiency | no data | 19.23 |
| Architecture | Terascale 2 (2009−2015) | RDNA 2.0 (2020−2025) |
| GPU code name | no data | Navi 21 |
| Market segment | Laptop | Desktop |
| Release date | 14 June 2011 (14 years ago) | 28 October 2020 (5 years ago) |
Detailed specifications
General parameters such as number of shaders, GPU core base clock and boost clock speeds, manufacturing process, texturing and calculation speed. Note that power consumption of some graphics cards can well exceed their nominal TDP, especially when overclocked.
| Pipelines / CUDA cores | 560 | 4608 |
| Boost clock speed | no data | 2105 MHz |
| Number of transistors | no data | 23,000 million |
| Manufacturing process technology | 40 nm | 7 nm |
| Power consumption (TDP) | no data | 255 Watt |
| Texture fill rate | no data | 606.2 |
| Floating-point processing power | no data | 19.4 TFLOPS |
| ROPs | no data | 64 |
| TMUs | no data | 288 |
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).
| Laptop size | medium sized | no data |
| Interface | no data | PCIe 4.0 x16 |
| Width | no data | 2-slot |
| Supplementary power connectors | no data | 2x 8-pin |
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 | no data | GDDR6 |
| Maximum RAM amount | no data | 16 GB |
| Memory bus width | no data | 256 Bit |
| Memory clock speed | no data | 16 GB/s |
| Memory bandwidth | no data | 512.0 GB/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 data | 1x HDMI, 2x DisplayPort, 1x USB Type-C |
| HDMI | - | + |
API and SDK support
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | 11 | 12 Ultimate (12_2) |
| Shader Model | no data | 6.5 |
| OpenGL | no data | 4.6 |
| OpenCL | no data | 2.0 |
| Vulkan | - | 1.2 |
Pros & cons summary
| Recency | 14 June 2011 | 28 October 2020 |
| Chip lithography | 40 nm | 7 nm |
RX 6900 has an age advantage of 9 years, and a 471.4% more advanced lithography process.
We couldn't decide between Radeon HD 6645G2 and Radeon RX 6900. We've got no test results to judge.
Be aware that Radeon HD 6645G2 is a notebook graphics card while Radeon RX 6900 is a desktop one.
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