Radeon RX 640 OEM vs T400
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | 465 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Architecture | Turing (2018−2022) | GCN 4.0 (2016−2020) |
| GPU code name | TU117 | Polaris 23 |
| Market segment | Desktop | Desktop |
| Release date | 6 May 2021 (3 years ago) | 9 April 2020 (4 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 | 384 | 640 |
| Core clock speed | no data | 1295 MHz |
| Boost clock speed | 1425 MHz | no data |
| Number of transistors | 4,700 million | 2,200 million |
| Manufacturing process technology | 12 nm | 14 nm |
| Power consumption (TDP) | 30 Watt | 50 Watt |
| Texture fill rate | 34.20 | 51.80 |
| Floating-point processing power | 1.094 gflops | 1.658 gflops |
| ROPs | 16 | 16 |
| TMUs | 24 | 40 |
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 x16 | PCIe 3.0 x8 |
| Width | 1-slot | 1-slot |
| 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 | GDDR6 | GDDR5 |
| Maximum RAM amount | 2 GB | 4 GB |
| Memory bus width | 64 Bit | 128 Bit |
| Memory clock speed | 10 GB/s | 6 GB/s |
| Memory bandwidth | 80 GB/s | 96 GB/s |
Connectivity and outputs
Types and number of video connectors present on the reviewed GPUs. As a rule, data in this section is precise only for desktop reference ones (so-called Founders Edition for NVIDIA chips). OEM manufacturers may change the number and type of output ports, while for notebook cards availability of certain video outputs ports depends on the laptop model rather than on the card itself.
| Display Connectors | 3x mini-DisplayPort | 1x DisplayPort 1.4a, 2x mini-DisplayPort 1.4a |
API compatibility
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | 12 (12_1) | 12 (12_0) |
| Shader Model | 6.6 | 6.7 (6.4) |
| OpenGL | 4.6 | 4.6 |
| OpenCL | 3.0 | 2.1 |
| Vulkan | 1.2 | 1.3 |
| CUDA | 7.5 | - |
Pros & cons summary
| Recency | 6 May 2021 | 9 April 2020 |
| Maximum RAM amount | 2 GB | 4 GB |
| Chip lithography | 12 nm | 14 nm |
| Power consumption (TDP) | 30 Watt | 50 Watt |
T400 has an age advantage of 1 year, a 16.7% more advanced lithography process, and 66.7% lower power consumption.
RX 640 OEM, on the other hand, has a 100% higher maximum VRAM amount.
We couldn't decide between T400 and Radeon RX 640 OEM. We've got no test results to judge.
Should you still have questions concerning choice between the reviewed GPUs, ask them in Comments section, and we shall answer.
Comparisons with similar GPUs
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