GeForce GT 620 vs GT 640
Aggregate performance score
We've compared GeForce GT 640 and GeForce GT 620, covering specs and all relevant benchmarks.
GT 640 outperforms GT 620 by a whopping 214% 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 | 1112 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 0.20 | 0.02 |
| Power efficiency | 3.27 | 1.38 |
| Architecture | Kepler (2012−2018) | Fermi (2010−2014) |
| GPU code name | GK107 | GF108 |
| Market segment | Desktop | Desktop |
| Release date | 5 June 2012 (12 years ago) | 15 May 2012 (12 years ago) |
| Launch price (MSRP) | $99 | $39.99 |
Cost-effectiveness evaluation
Performance to price ratio. The higher, the better.
GT 640 has 900% better value for money than GT 620.
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 | 96 |
| Core clock speed | 902 MHz | 700 MHz |
| Number of transistors | 1,270 million | 585 million |
| Manufacturing process technology | 28 nm | 40 nm |
| Power consumption (TDP) | 65 Watt | 49 Watt |
| Maximum GPU temperature | no data | 98 °C |
| Texture fill rate | 28.86 | 11.20 |
| Floating-point processing power | 0.6927 TFLOPS | 0.2688 TFLOPS |
| ROPs | 16 | 4 |
| TMUs | 32 | 16 |
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).
| Bus support | no data | PCI Express 2.0 |
| Interface | PCIe 3.0 x16 | PCIe 2.0 x16 |
| Length | 145 mm | 145 mm |
| Height | no data | 2.7" (6.9 cm) |
| 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 | DDR3 |
| Maximum RAM amount | 2 GB | 1 GB |
| Memory bus width | 128 Bit | 64 Bit |
| Memory clock speed | 891 MHz | 1.8 GB/s |
| Memory bandwidth | 28.51 GB/s | 14.4 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 | Dual Link DVI-I, HDMI, VGA |
| Multi monitor support | no data | + |
| HDMI | + | + |
| HDCP | - | + |
| Maximum VGA resolution | no data | 2048x1536 |
| Audio input for HDMI | no data | Internal |
Supported technologies
Supported technological solutions. This information will prove useful if you need some particular technology for your purposes.
| 3D Blu-Ray | - | + |
API compatibility
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | 12 (11_0) | 12 (11_0) |
| Shader Model | 5.1 | 5.1 |
| OpenGL | 4.6 | 4.2 |
| OpenCL | 1.2 | 1.1 |
| Vulkan | 1.1.126 | N/A |
| 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.
GeekBench 5 OpenCL
Geekbench 5 is a widespread graphics card benchmark combined from 11 different test scenarios. All these scenarios rely on direct usage of GPU's processing power, no 3D rendering is involved. This variation uses OpenCL API by Khronos Group.
Octane Render OctaneBench
This is a special benchmark measuring graphics card performance in OctaneRender, which is a realistic GPU rendering engine by OTOY Inc., available either as a standalone program, or as a plugin for 3DS Max, Cinema 4D and many other apps. It renders four different static scenes, then compares render times with a reference GPU which is currently GeForce GTX 980. This benchmark has nothing to do with gaming and is aimed at professional 3D graphics artists.
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 | 0.97 |
| Maximum RAM amount | 2 GB | 1 GB |
| Chip lithography | 28 nm | 40 nm |
| Power consumption (TDP) | 65 Watt | 49 Watt |
GT 640 has a 214.4% higher aggregate performance score, a 100% higher maximum VRAM amount, and a 42.9% more advanced lithography process.
GT 620, on the other hand, has 32.7% lower power consumption.
The GeForce GT 640 is our recommended choice as it beats the GeForce GT 620 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.
