GeForce 840A vs GeForce GT 640M
Find out if it is worth upgrading your current GPU setup by comparing GeForce 840A and GeForce GT 640M. Here you can take a closer look at graphics cards specs, such as core clock speed, memory type and size, display connectors, etc. The price, overall benchmark and gaming performances are usually defining factors when it comes to choosing between GeForce 840A and GeForce GT 640M. Make sure that the graphics card has compatible dimensions and will properly fit in your new or current computer case. Also these graphics cards may have different system power recommendations, so take that into consideration and upgrade your PSU if necessary.
GeForce 840A
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 840A | GeForce GT 640M | |
| Power consumption (TDP) | 33 Watt | 32 Watt |
| Interface | PCIe 3.0 x8 | PCIe 3.0 x16 |
| Memory type | DDR3 | DDR3\GDDR5 |
| Maximum RAM amount | 2 GB | 2 GB |
| Display Connectors | No outputs | No outputs |
| Check Price |
- GeForce 840A has 3% more power consumption, than GeForce GT 640M.
- GeForce 840A is connected by PCIe 3.0 x8, and GeForce GT 640M uses PCIe 3.0 x16 interface.
- GeForce 840A and GeForce GT 640M have maximum RAM of 2 GB.
- GeForce 840A is used in Desktops, and GeForce GT 640M - in Laptops.
- GeForce 840A is build with Maxwell architecture, and GeForce GT 640M - with Kepler.
- GeForce 840A and GeForce GT 640M are manufactured by 28 nm process technology.
- Memory clock speed of GeForce 840A is 202 MHz higher, than GeForce GT 640M.
Game benchmarks
| high / 1080p | 3−4 | 0−1 |
| ultra / 1080p | 2−3 | 0−1 |
| QHD / 1440p | 0−1 | 0−1 |
| low / 720p | 14−16 | 10−12 |
| medium / 1080p | 5−6 | 2−3 |
| The average gaming FPS of GeForce 840A in Assassin's Creed Odyssey is 66% more, than GeForce GT 640M. | ||
| ultra / 1080p | 7−8 | 3−4 |
| QHD / 1440p | 0−1 | 0−1 |
| low / 720p | 18−20 | 12−14 |
| medium / 1080p | 8−9 | 4−5 |
| The average gaming FPS of GeForce 840A in Battlefield 5 is 57% more, than GeForce GT 640M. | ||
| low / 768p | 45−50 | 50−55 |
| high / 1080p | 30−35 | 45−50 |
| QHD / 1440p | 0−1 | 0−1 |
| The average gaming FPS of GeForce GT 640M in Call of Duty: Warzone is 25% more, than GeForce 840A. | ||
| low / 768p | 120−130 | 110−120 |
| medium / 768p | 90−95 | 85−90 |
| ultra / 1080p | 40−45 | 35−40 |
| QHD / 1440p | 24−27 | − |
| 4K / 2160p | 18−20 | 10−11 |
| high / 768p | 65−70 | 55−60 |
| The average gaming FPS of GeForce 840A in Counter-Strike: Global Offensive is 13% more, than GeForce GT 640M. | ||
| low / 768p | 80−85 | 70−75 |
| ultra / 1080p | 14−16 | 12−14 |
| medium / 1080p | 40−45 | 45−50 |
| The average gaming FPS of GeForce 840A in Cyberpunk 2077 is 4% more, than GeForce GT 640M. | ||
| low / 768p | 75−80 | 70−75 |
| medium / 768p | 50−55 | 40−45 |
| ultra / 1080p | 27−30 | 18−20 |
| The average gaming FPS of GeForce 840A in Dota 2 is 18% more, than GeForce GT 640M. | ||
| high / 1080p | 5−6 | 2−3 |
| ultra / 1080p | − | 2−3 |
| 4K / 2160p | 2−3 | 0−1 |
| low / 720p | 14−16 | 9−10 |
| medium / 1080p | 6−7 | 3−4 |
| The average gaming FPS of GeForce 840A in Far Cry 5 is 80% more, than GeForce GT 640M. | ||
| high / 1080p | 12−14 | − |
| ultra / 1080p | 7−8 | 5−6 |
| QHD / 1440p | − | 1−2 |
| low / 720p | 50−55 | 45−50 |
| medium / 1080p | 14−16 | 7−8 |
| The average gaming FPS of GeForce 840A in Fortnite is 25% more, than GeForce GT 640M. | ||
| high / 1080p | 7−8 | 2−3 |
| QHD / 1440p | 0−1 | 0−1 |
| low / 720p | 20−22 | 14−16 |
| medium / 1080p | 9−10 | 5−6 |
| The average gaming FPS of GeForce 840A in Forza Horizon 4 is 71% more, than GeForce GT 640M. | ||
| low / 768p | 45−50 | 40−45 |
| high / 1080p | 8−9 | 3−4 |
| ultra / 1080p | 5−6 | 2−3 |
| QHD / 1440p | 0−1 | 0−1 |
| medium / 720p | 40−45 | 30−35 |
| The average gaming FPS of GeForce 840A in Grand Theft Auto V is 30% more, than GeForce GT 640M. | ||
| high / 1080p | 3−4 | 1−2 |
| ultra / 1080p | 1−2 | 0−1 |
| 4K / 2160p | 0−1 | 0−1 |
| low / 720p | 8−9 | 2−3 |
| medium / 1080p | 4−5 | 2−3 |
| The average gaming FPS of GeForce 840A in Metro Exodus is 150% more, than GeForce GT 640M. | ||
| low / 768p | 85−90 | 85−90 |
| high / 1080p | 85−90 | 55−60 |
| ultra / 1080p | 80−85 | − |
| medium / 1080p | 85−90 | − |
| The average gaming FPS of GeForce 840A in Minecraft is 20% more, than GeForce GT 640M. | ||
| high / 1080p | − | 14−16 |
| ultra / 1080p | 12−14 | 12−14 |
| low / 720p | 27−30 | 24−27 |
| medium / 1080p | 14−16 | 14−16 |
| The average gaming FPS of GeForce 840A in PLAYERUNKNOWN'S BATTLEGROUNDS is 5% more, than GeForce GT 640M. | ||
| ultra / 1080p | 7−8 | 3−4 |
| QHD / 1440p | 0−1 | 0−1 |
| low / 720p | 8−9 | 3−4 |
| The average gaming FPS of GeForce 840A in Red Dead Redemption 2 is 166% more, than GeForce GT 640M. | ||
| low / 768p | 16−18 | 7−8 |
| medium / 768p | 12−14 | 6−7 |
| high / 1080p | 6−7 | 3−4 |
| ultra / 1080p | 5−6 | − |
| 4K / 2160p | − | 0−1 |
| The average gaming FPS of GeForce 840A in The Witcher 3: Wild Hunt is 140% more, than GeForce GT 640M. | ||
| low / 768p | 70−75 | 70−75 |
| medium / 768p | 35−40 | 35−40 |
| ultra / 1080p | 16−18 | 12−14 |
| high / 768p | 30−35 | 27−30 |
| The average gaming FPS of GeForce 840A in World of Tanks is 5% more, than GeForce GT 640M. | ||
Full Specs
| GeForce 840A | GeForce GT 640M | |
| Architecture | Maxwell | Kepler |
| Code name | GM108 | N13P-GS |
| Type | Desktop | Laptop |
| Release date | 17 March 2014 | 22 March 2012 |
| Pipelines | 384 | 384 |
| Core clock speed | 1029 MHz | |
| Boost Clock | 1124 MHz | 645 MHz |
| Transistor count | 1,270 million | |
| Manufacturing process technology | 28 nm | 28 nm |
| Texture fill rate | 17.98 | |
| Floating-point performance | 863.2 gflops | 480.0 gflops |
| Memory bus width | 64 Bit | 128bit |
| Memory clock speed | 2002 MHz | 1800 - 4000 MHz |
| Memory bandwidth | 16.02 GB/s | |
| Shared memory | - | |
| DirectX | 12 (11_0) | 12 API |
| Shader Model | 5.1 | 5.1 |
| OpenGL | 4.6 | 4.5 |
| OpenCL | 1.2 | 1.1 |
| Vulkan | 1.1.126 | 1.1.126 |
| CUDA | 5.0 | + |
| 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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