GeForce GT 640 vs GeForce GTX 850M

When comparing GeForce GT 640 and GeForce GTX 850M, we look primarily at benchmarks and game tests. But it is not only about the numbers. Often you can find third-party models with higher clock speeds, better cooling, or a customizable RGB lighting. Not all of them will have all the features you need. Another thing to consider is the port selection. Most graphics cards have at least one DisplayPort and HDMI interface, but some monitors require DVI. Before you buy, check the TDP of the graphics card - this characteristic will help you estimate the consumption of the graphics card. You may even have to upgrade your PSU to meet its requirements. An important factor when choosing between GeForce GT 640 and GeForce GTX 850M is the price. Does the additional cost justify the performance hit? Our comparison should help you make the right decision.

GeForce GTX 850M is a Laptop Graphics Card

Note: GeForce GTX 850M 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 GTX 850M here:

Main Specs

  GeForce GT 640 GeForce GTX 850M
Power consumption (TDP) 65 Watt 45 Watt
Interface PCIe 3.0 x16 PCIe 3.0 x16
Supplementary power connectors None
Memory type DDR3 DDR3, GDDR5
Maximum RAM amount 2 GB 4 GB
Display Connectors 1x DVI, 1x HDMI, 1x DisplayPort No outputs
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  • GeForce GT 640 has 44% more power consumption, than GeForce GTX 850M.
  • Both video cards are using PCIe 3.0 x16 interface connection to a motherboard.
  • GeForce GTX 850M has 2 GB more memory, than GeForce GT 640.
  • GeForce GT 640 is used in Desktops, and GeForce GTX 850M - in Laptops.
  • GeForce GT 640 is build with Kepler architecture, and GeForce GTX 850M - with Maxwell.
  • GeForce GT 640 and GeForce GTX 850M are manufactured by 28 nm process technology.

Game benchmarks

high / 1080p 2−3 12−14
ultra / 1080p 1−2 8−9
QHD / 1440p 0−1 2−3
low / 720p 14−16 27−30
medium / 1080p 5−6 16−18
The average gaming FPS of GeForce GTX 850M in Assassin's Creed Odyssey is 166% more, than GeForce GT 640.

Full Specs

  GeForce GT 640 GeForce GTX 850M
Architecture Kepler Maxwell
Code name GK107 N15P-GT
Type Desktop Laptop
Release date 5 June 2012 12 March 2014
Pipelines 384 640
Core clock speed 902 MHz
Transistor count 1,270 million 1,870 million
Manufacturing process technology 28 nm 28 nm
Texture fill rate 28.86 36.08
Floating-point performance 692.7 gflops 1,155 gflops
Length 145 mm
Memory bus width 128 Bit 128 Bit
Memory clock speed 1782 MHz
Memory bandwidth 28.51 GB/s 80.0 GB/s
Shared memory -
DirectX 12 (11_0) 12 (11_0)
Shader Model 5.1 5.1
OpenGL 4.6 4.5
OpenCL 1.2 1.1
Vulkan 1.1.126 1.1.126
CUDA 3.0 +
CUDA cores 640
Bus support PCI Express 2.0, PCI Express 3.0
SLI options +
HDMI +
Bitcoin / BTC (SHA256) 24 Mh/s 153 Mh/s
Laptop size medium sized
Standard memory configuration DDR3 or GDDR5
eDP 1.2 signal support Up to 3840x2160
LVDS signal support Up to 1920x1200
DisplayPort Multimode (DP++) support Up to 3840x2160
HDCP content protection +
7.1 channel HD audio on HDMI +
TrueHD and DTS-HD audio bitstreaming +
H.264, VC1, MPEG2 1080p video decoder +
Optimus +
Ethereum / ETH (DaggerHashimoto) 1.8 Mh/s
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