Radeon RX 6400 vs GeForce GT 640
Aggregate performance score
We've compared GeForce GT 640 and Radeon RX 6400, covering specs and all relevant benchmarks.
RX 6400 outperforms GT 640 by a whopping 546% based on our aggregate benchmark results.
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | 765 | 276 |
| Place by popularity | not in top-100 | 100 |
| Cost-effectiveness evaluation | 0.20 | 53.38 |
| Power efficiency | 3.26 | 25.84 |
| Architecture | Kepler (2012−2018) | RDNA 2.0 (2020−2024) |
| GPU code name | GK107 | Navi 24 |
| Market segment | Desktop | Desktop |
| Release date | 5 June 2012 (12 years ago) | 19 January 2022 (2 years ago) |
| Launch price (MSRP) | $99 | $159 |
Cost-effectiveness evaluation
Performance to price ratio. The higher, the better.
RX 6400 has 26590% better value for money than GT 640.
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 | 768 |
| Core clock speed | 902 MHz | 1923 MHz |
| Boost clock speed | no data | 2321 MHz |
| Number of transistors | 1,270 million | 5,400 million |
| Manufacturing process technology | 28 nm | 6 nm |
| Power consumption (TDP) | 65 Watt | 53 Watt |
| Texture fill rate | 28.86 | 111.4 |
| Floating-point processing power | 0.6927 TFLOPS | 3.565 TFLOPS |
| ROPs | 16 | 32 |
| TMUs | 32 | 48 |
| Ray Tracing Cores | no data | 12 |
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 4.0 x4 |
| Length | 145 mm | no data |
| 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 | DDR3 | GDDR6 |
| Maximum RAM amount | 2 GB | 4 GB |
| Memory bus width | 128 Bit | 64 Bit |
| Memory clock speed | 891 MHz | 2000 MHz |
| Memory bandwidth | 28.51 GB/s | 128.0 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 | 1x DVI, 1x HDMI, 1x DisplayPort | 1x HDMI 2.1, 1x DisplayPort 1.4a |
| HDMI | + | + |
API compatibility
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | 12 (11_0) | 12 Ultimate (12_2) |
| Shader Model | 5.1 | 6.7 |
| OpenGL | 4.6 | 4.6 |
| OpenCL | 1.2 | 2.2 |
| Vulkan | 1.1.126 | 1.3 |
| CUDA | 3.0 | - |
Synthetic benchmark performance
Non-gaming benchmark results comparison. The combined score is measured on a 0-100 point scale.
Combined synthetic benchmark score
This is our combined benchmark score. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.
Passmark
This is the most ubiquitous GPU benchmark. It gives the graphics card a thorough evaluation under various types of load, providing four separate benchmarks for Direct3D versions 9, 10, 11 and 12 (the last being done in 4K resolution if possible), and few more tests engaging DirectCompute capabilities.
Gaming performance
Let's see how good the compared graphics cards are for gaming. Particular gaming benchmark results are measured in FPS.
Pros & cons summary
| Performance score | 3.05 | 19.70 |
| Recency | 5 June 2012 | 19 January 2022 |
| Maximum RAM amount | 2 GB | 4 GB |
| Chip lithography | 28 nm | 6 nm |
| Power consumption (TDP) | 65 Watt | 53 Watt |
RX 6400 has a 545.9% higher aggregate performance score, an age advantage of 9 years, a 100% higher maximum VRAM amount, a 366.7% more advanced lithography process, and 22.6% lower power consumption.
The Radeon RX 6400 is our recommended choice as it beats the GeForce GT 640 in performance tests.
Should you still have questions concerning choice between the reviewed GPUs, ask them in Comments section, and we shall answer.
Comparisons with similar GPUs
We selected several comparisons of graphics cards with performance close to those reviewed, providing you with more options to consider.
