GeForce GT 645M vs Iris Plus Graphics 640

If you are going to buy a new graphics card and are choosing between GeForce GT 645M and Iris Plus Graphics 640, 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 645M stacks up against Iris Plus Graphics 640, check out specs charts below.

GeForce GT 645M and Iris Plus Graphics 640 are Laptop Graphics Cards

Note: GeForce GT 645M and Iris Plus Graphics 640 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 645M or Iris Plus Graphics 640 here:

Main Specs

  GeForce GT 645M Iris Plus Graphics 640
Power consumption (TDP) 32 Watt 15 Watt
Interface PCIe 3.0 x16 PCIe 3.0 x1
Memory type DDR3\GDDR5 DDR3L/LPDDR3/DDR4
Maximum RAM amount 2 GB 32 GB
Display Connectors No outputs No outputs
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  • GeForce GT 645M has 113% more power consumption, than Iris Plus Graphics 640.
  • GeForce GT 645M is connected by PCIe 3.0 x16, and Iris Plus Graphics 640 uses PCIe 3.0 x1 interface.
  • Iris Plus Graphics 640 has 30 GB more memory, than GeForce GT 645M.
  • Both cards are used in Laptops.
  • GeForce GT 645M is build with Kepler architecture, and Iris Plus Graphics 640 - with Gen. 9.5 Kaby Lake.
  • GeForce GT 645M is manufactured by 28 nm process technology, and Iris Plus Graphics 640 - by 14 nm process technology.

Game benchmarks

high / 1080p 1−2 6−7
ultra / 1080p 0−1 4−5
QHD / 1440p 0−1 0−1
low / 720p 12−14 16−18
medium / 1080p 2−3 8−9
The average gaming FPS of Iris Plus Graphics 640 in Assassin's Creed Odyssey is 100% more, than GeForce GT 645M.

Full Specs

  GeForce GT 645M Iris Plus Graphics 640
Architecture Kepler Gen. 9.5 Kaby Lake
Code name N13P-GS Kaby Lake GT3e
Type Laptop Laptop
Release date 22 March 2012 3 January 2017
Pipelines 384 48
Core clock speed 300 MHz
Boost Clock 1050 MHz
Transistor count 1,270 million 189 million
Manufacturing process technology 28 nm 14 nm
Texture fill rate 22.7 billion/sec 52.80
Floating-point performance 544.5 gflops
Memory bus width 128bit 64/128 Bit
Memory clock speed 1800 MHz
Shared memory - +
DirectX 12 API 12 (12_1)
Shader Model 5.1 6.4
OpenGL 4.5 4.6
OpenCL 1.1 2.1
Vulkan 1.1.126 1.1.103
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) 19 Mh/s
Laptop size medium sized
Optimus +
Quick Sync +
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