GeForce GT 640M vs GeForce GT 755M SLI

If you are going to buy a new graphics card and are choosing between GeForce GT 640M and GeForce GT 755M SLI, 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 GT 640M stacks up against GeForce GT 755M SLI, check out specs charts below.

GeForce GT 640M and GeForce GT 755M SLI are Laptop Graphics Cards

Note: GeForce GT 640M and GeForce GT 755M SLI are only used in laptop graphics. They have 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 or GeForce GT 755M SLI here:

Main Specs

  GeForce GT 640M GeForce GT 755M SLI
Power consumption (TDP) 32 Watt 2x ~50 Watt
Interface PCIe 3.0 x16
Memory type DDR3\GDDR5 GDDR5
Maximum RAM amount 2 GB 2x 2 GB
Display Connectors No outputs
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  • GeForce GT 640M has 1500% more power consumption, than GeForce GT 755M SLI.
  • GeForce GT 640M and GeForce GT 755M SLI have maximum RAM of 2 GB.
  • Both cards are used in Laptops.
  • GeForce GT 640M and GeForce GT 755M SLI are build with Kepler architecture.
  • GeForce GT 640M and GeForce GT 755M SLI are manufactured by 28 nm process technology.
  • Memory clock speed of GeForce GT 755M SLI is 3600 MHz higher, than GeForce GT 640M.

Game benchmarks

high / 1080p 0−1 14−16
ultra / 1080p 0−1 8−9
QHD / 1440p 0−1 2−3
low / 720p 10−12 30−35
medium / 1080p 2−3 18−20
The average gaming FPS of GeForce GT 755M SLI in Assassin's Creed Odyssey is 316% more, than GeForce GT 640M.

Full Specs

  GeForce GT 640M GeForce GT 755M SLI
Architecture Kepler Kepler
Code name N13P-GS N14P-?
Type Laptop Laptop
Release date 22 March 2012 1 November 2013
Pipelines 384 768
Core clock speed 980 MHz
Boost Clock 645 MHz
Transistor count 1,270 million 2x 1300 Million
Manufacturing process technology 28 nm 28 nm
Floating-point performance 480.0 gflops
Memory bus width 128bit 2x 128 Bit
Memory clock speed 1800 - 4000 MHz 5400 MHz
Shared memory - -
DirectX 12 API DirectX 11, Shader 5.0
Shader Model 5.1
OpenGL 4.5
OpenCL 1.1
Vulkan 1.1.126
CUDA + +
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 large
Optimus +
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