RTX PRO 4000 Blackwell SFF vs Radeon RX 6900
Contents
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | 34 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Power efficiency | 19.06 | no data |
| Architecture | RDNA 2.0 (2020−2025) | Blackwell 2.0 (2025) |
| GPU code name | Navi 21 | GB203 |
| Market segment | Desktop | Workstation |
| Release date | 28 October 2020 (4 years ago) | 11 August 2025 (recently) |
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 | 4608 | 8960 |
| Core clock speed | no data | 790 MHz |
| Boost clock speed | 2105 MHz | 1337 MHz |
| Number of transistors | 23,000 million | 45,600 million |
| Manufacturing process technology | 7 nm | 5 nm |
| Power consumption (TDP) | 255 Watt | 70 Watt |
| Texture fill rate | 606.2 | 374.4 |
| Floating-point processing power | 19.4 TFLOPS | 23.96 TFLOPS |
| ROPs | 64 | 96 |
| TMUs | 288 | 280 |
| Tensor Cores | no data | 280 |
| Ray Tracing Cores | no data | 70 |
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 4.0 x16 | PCIe 5.0 x8 |
| Length | no data | 167 mm |
| Width | 2-slot | 1-slot |
| Supplementary power connectors | 2x 8-pin | 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 | GDDR6 | GDDR7 |
| Maximum RAM amount | 16 GB | 24 GB |
| Memory bus width | 256 Bit | 192 Bit |
| Memory clock speed | 16 GB/s | 1125 MHz |
| Memory bandwidth | 512.0 GB/s | 432.0 GB/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, 2x DisplayPort, 1x USB Type-C | 4x mini-DisplayPort 2.1b |
| HDMI | + | - |
API and SDK compatibility
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | 12 Ultimate (12_2) | 12 Ultimate (12_2) |
| Shader Model | 6.5 | 6.8 |
| OpenGL | 4.6 | 4.6 |
| OpenCL | 2.0 | 3.0 |
| Vulkan | 1.2 | 1.4 |
| CUDA | - | 12.0 |
| DLSS | - | + |
Pros & cons summary
| Recency | 28 October 2020 | 11 August 2025 |
| Maximum RAM amount | 16 GB | 24 GB |
| Chip lithography | 7 nm | 5 nm |
| Power consumption (TDP) | 255 Watt | 70 Watt |
RTX PRO 4000 Blackwell SFF has an age advantage of 4 years, a 50% higher maximum VRAM amount, a 40% more advanced lithography process, and 264.3% lower power consumption.
We couldn't decide between Radeon RX 6900 and RTX PRO 4000 Blackwell SFF. We've got no test results to judge.
Be aware that Radeon RX 6900 is a desktop graphics card while RTX PRO 4000 Blackwell SFF is a workstation one.
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