GeForce 840M vs Iris Plus Graphics 640

Find out if it is worth upgrading your current GPU setup by comparing GeForce 840M and Iris Plus Graphics 640. 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 840M and Iris Plus Graphics 640. 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 840M and Iris Plus Graphics 640 are Laptop Graphics Cards

Note: GeForce 840M 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 840M or Iris Plus Graphics 640 here:

Main Specs

  GeForce 840M Iris Plus Graphics 640
Power consumption (TDP) 33 Watt 15 Watt
Interface PCIe 3.0 x8 PCIe 3.0 x1
Memory type DDR3 DDR3L/LPDDR3/DDR4
Maximum RAM amount 4 GB 32 GB
Display Connectors No outputs No outputs
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  • GeForce 840M has 120% more power consumption, than Iris Plus Graphics 640.
  • GeForce 840M is connected by PCIe 3.0 x8, and Iris Plus Graphics 640 uses PCIe 3.0 x1 interface.
  • Iris Plus Graphics 640 has 28 GB more memory, than GeForce 840M.
  • Both cards are used in Laptops.
  • GeForce 840M is build with Maxwell architecture, and Iris Plus Graphics 640 - with Gen. 9.5 Kaby Lake.
  • Core clock speed of GeForce 840M is 729 MHz higher, than Iris Plus Graphics 640.
  • GeForce 840M 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 3−4 8−9
The average gaming FPS of Iris Plus Graphics 640 in Assassin's Creed Odyssey is 66% more, than GeForce 840M.

Full Specs

  GeForce 840M Iris Plus Graphics 640
Architecture Maxwell Gen. 9.5 Kaby Lake
Code name N15S-GT Kaby Lake GT3e
Type Laptop Laptop
Release date 12 March 2014 3 January 2017
Pipelines 384 48
Core clock speed 1029 MHz 300 MHz
Boost Clock 1124 MHz 1050 MHz
Transistor count 189 million
Manufacturing process technology 28 nm 14 nm
Texture fill rate 17.98 52.80
Floating-point performance 863.2 gflops
Memory bus width 64 Bit 64/128 Bit
Memory clock speed 2000 MHz
Memory bandwidth 16.02 GB/s
Shared memory - +
DirectX 12 (11_0) 12 (12_1)
Shader Model 5.1 6.4
OpenGL 4.5 4.6
OpenCL 1.2 2.1
Vulkan 1.1.126 1.1.103
CUDA +
Bus support PCI Express 2.0, PCI Express 3.0
Bitcoin / BTC (SHA256) 92 Mh/s
Laptop size medium sized
Optimus +
Quick Sync +
GPU Boost 2.0
GameWorks +
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