GeForce 820A vs GeForce GT 640M
If you are going to buy a new graphics card and are choosing between GeForce 820A and GeForce GT 640M, there are a couple of things to consider. Cards with more VRAM in general perform better and allow you to play on higher graphics settings. Size also makes a difference. A model with a large heatsink can occupy up to three expansion slots on a motherboard. Be sure you have enough room in your PC case. When comparing GPUs with different architectures, more processing cores and even higher TFLOPS will not always translate to better performance. To help you decide which GPU you need, we have measured frame rates in a number of popular games. For more on how the GeForce 820A stacks up against GeForce GT 640M, check out specs charts below.
GeForce 820A
GeForce GT 640M is a Laptop Graphics Card
Note: GeForce GT 640M is only used in laptop graphics. It has lower GPU clock speed compared to the desktop variant, which results in lower power consumption, but also 10-30% lower gaming performance. Check available laptop models with GeForce GT 640M here:
Main Specs
| GeForce 820A | GeForce GT 640M | |
| Power consumption (TDP) | 15 Watt | 32 Watt |
| Interface | PCIe 2.0 x16 | PCIe 3.0 x16 |
| Memory type | DDR3 | DDR3\GDDR5 |
| Maximum RAM amount | 1 GB | 2 GB |
| Display Connectors | No outputs | No outputs |
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- GeForce GT 640M has 113% more power consumption, than GeForce 820A.
- GeForce 820A is connected by PCIe 2.0 x16, and GeForce GT 640M uses PCIe 3.0 x16 interface.
- GeForce GT 640M has 1 GB more memory, than GeForce 820A.
- GeForce 820A is used in Desktops, and GeForce GT 640M - in Laptops.
- GeForce 820A is build with Fermi 2.0 architecture, and GeForce GT 640M - with Kepler.
- GeForce 820A and GeForce GT 640M are manufactured by 28 nm process technology.
- Memory clock speed of GeForce 820A and GeForce GT 640M is 1800 MHz.
Game benchmarks
| high / 1080p | 0−1 | 0−1 |
| ultra / 1080p | − | 0−1 |
| QHD / 1440p | 0−1 | 0−1 |
| low / 720p | 1−2 | 10−12 |
| medium / 1080p | 0−1 | 2−3 |
| The average gaming FPS of GeForce GT 640M in Assassin's Creed Odyssey is 1000% more, than GeForce 820A. | ||
| ultra / 1080p | − | 3−4 |
| QHD / 1440p | 0−1 | 0−1 |
| low / 720p | 0−1 | 12−14 |
| medium / 1080p | − | 4−5 |
| low / 768p | 50−55 | 50−55 |
| high / 1080p | 45−50 | 45−50 |
| QHD / 1440p | 0−1 | 0−1 |
| GeForce 820A and GeForce GT 640M have the same average FPS in Call of Duty: Warzone. | ||
| low / 768p | 60−65 | 110−120 |
| medium / 768p | 27−30 | 85−90 |
| ultra / 1080p | 7−8 | 35−40 |
| 4K / 2160p | − | 10−11 |
| high / 768p | 16−18 | 55−60 |
| The average gaming FPS of GeForce GT 640M in Counter-Strike: Global Offensive is 164% more, than GeForce 820A. | ||
| low / 768p | 70−75 | 70−75 |
| ultra / 1080p | 0−1 | 12−14 |
| medium / 1080p | 45−50 | 45−50 |
| GeForce 820A and GeForce GT 640M have the same average FPS in Cyberpunk 2077. | ||
| low / 768p | 45−50 | 70−75 |
| medium / 768p | 10−11 | 40−45 |
| ultra / 1080p | 0−1 | 18−20 |
| The average gaming FPS of GeForce GT 640M in Dota 2 is 96% more, than GeForce 820A. | ||
| high / 1080p | − | 2−3 |
| ultra / 1080p | − | 2−3 |
| 4K / 2160p | − | 0−1 |
| low / 720p | 0−1 | 9−10 |
| medium / 1080p | − | 3−4 |
| ultra / 1080p | − | 5−6 |
| QHD / 1440p | − | 1−2 |
| low / 720p | 21−24 | 45−50 |
| medium / 1080p | 0−1 | 7−8 |
| The average gaming FPS of GeForce GT 640M in Fortnite is 113% more, than GeForce 820A. | ||
| high / 1080p | 0−1 | 2−3 |
| QHD / 1440p | 0−1 | 0−1 |
| low / 720p | 0−1 | 14−16 |
| medium / 1080p | 0−1 | 5−6 |
| low / 768p | 18−20 | 40−45 |
| high / 1080p | 0−1 | 3−4 |
| ultra / 1080p | − | 2−3 |
| QHD / 1440p | 0−1 | 0−1 |
| medium / 720p | 12−14 | 30−35 |
| The average gaming FPS of GeForce GT 640M in Grand Theft Auto V is 131% more, than GeForce 820A. | ||
| high / 1080p | − | 1−2 |
| ultra / 1080p | − | 0−1 |
| 4K / 2160p | − | 0−1 |
| low / 720p | 0−1 | 2−3 |
| medium / 1080p | − | 2−3 |
| low / 768p | 75−80 | 85−90 |
| high / 1080p | 27−30 | 55−60 |
| The average gaming FPS of GeForce GT 640M in Minecraft is 35% more, than GeForce 820A. | ||
| high / 1080p | − | 14−16 |
| ultra / 1080p | − | 12−14 |
| low / 720p | 8−9 | 24−27 |
| medium / 1080p | − | 14−16 |
| The average gaming FPS of GeForce GT 640M in PLAYERUNKNOWN'S BATTLEGROUNDS is 212% more, than GeForce 820A. | ||
| ultra / 1080p | − | 3−4 |
| QHD / 1440p | − | 0−1 |
| low / 720p | 0−1 | 3−4 |
| low / 768p | 0−1 | 7−8 |
| medium / 768p | − | 6−7 |
| high / 1080p | − | 3−4 |
| 4K / 2160p | − | 0−1 |
| low / 768p | 45−50 | 70−75 |
| medium / 768p | 14−16 | 35−40 |
| ultra / 1080p | 0−1 | 12−14 |
| high / 768p | 12−14 | 27−30 |
| The average gaming FPS of GeForce GT 640M in World of Tanks is 84% more, than GeForce 820A. | ||
Full Specs
| GeForce 820A | GeForce GT 640M | |
| Architecture | Fermi 2.0 | Kepler |
| Code name | GF117 | N13P-GS |
| Type | Desktop | Laptop |
| Release date | 17 March 2014 | 22 March 2012 |
| Pipelines | 96 | 384 |
| Core clock speed | 775 MHz | |
| Boost Clock | 645 MHz | |
| Transistor count | 585 million | 1,270 million |
| Manufacturing process technology | 28 nm | 28 nm |
| Texture fill rate | 12.40 | |
| Floating-point performance | 297.6 gflops | 480.0 gflops |
| Memory bus width | 64 Bit | 128bit |
| Memory clock speed | 1800 MHz | 1800 - 4000 MHz |
| Memory bandwidth | 14.4 GB/s | |
| Shared memory | - | |
| DirectX | 12 (11_0) | 12 API |
| Shader Model | 5.1 | 5.1 |
| OpenGL | 4.6 | 4.5 |
| OpenCL | 1.1 | 1.1 |
| Vulkan | N/A | 1.1.126 |
| CUDA | 2.1 | + |
| CUDA cores | 384 | |
| Bus support | PCI Express 2.0, PCI Express 3.0 | |
| HDMI | + | |
| HDCP | + | |
| Maximum VGA resolution | Up to 2048x1536 | |
| 3D Blu-Ray | + | |
| Bitcoin / BTC (SHA256) | 18 Mh/s | |
| Laptop size | medium sized | |
| Optimus | + | |
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