GeForce GT 645M vs GeForce GTX 970M

If you are going to buy a new graphics card and are choosing between GeForce GT 645M and GeForce GTX 970M, 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 GeForce GTX 970M, check out specs charts below.

GeForce GT 645M and GeForce GTX 970M are Laptop Graphics Cards

Note: GeForce GT 645M and GeForce GTX 970M 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 GeForce GTX 970M here:

Main Specs

  GeForce GT 645M GeForce GTX 970M
Power consumption (TDP) 32 Watt
Interface PCIe 3.0 x16 MXM-B (3.0)
Supplementary power connectors None
Memory type DDR3\GDDR5 GDDR5
Maximum RAM amount 2 GB 6 GB
Display Connectors No outputs No outputs
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  • GeForce GT 645M is connected by PCIe 3.0 x16, and GeForce GTX 970M uses MXM-B (3.0) interface.
  • GeForce GTX 970M has 4 GB more memory, than GeForce GT 645M.
  • Both cards are used in Laptops.
  • GeForce GT 645M is build with Kepler architecture, and GeForce GTX 970M - with Maxwell.
  • GeForce GT 645M and GeForce GTX 970M are manufactured by 28 nm process technology.
  • Memory clock speed of GeForce GTX 970M is 700 MHz higher, than GeForce GT 645M.

Game benchmarks

high / 1080p 1−2 35−40
ultra / 1080p 0−1 21−24
QHD / 1440p 0−1 16−18
4K / 2160p 10−11
low / 720p 12−14 60−65
medium / 1080p 2−3 40−45
The average gaming FPS of GeForce GTX 970M in Assassin's Creed Odyssey is 840% more, than GeForce GT 645M.

Full Specs

  GeForce GT 645M GeForce GTX 970M
Architecture Kepler Maxwell
Code name N13P-GS GM204
Type Laptop Laptop
Release date 22 March 2012 7 October 2014
Pipelines 384 1280
Core clock speed 924 MHz
Boost Clock 1038 MHz
Transistor count 1,270 million 5,200 million
Manufacturing process technology 28 nm 28 nm
Texture fill rate 22.7 billion/sec 83.04
Floating-point performance 544.5 gflops 2,657 gflops
Memory bus width 128bit 192 Bit
Memory clock speed 1800 MHz 2500 MHz
Memory bandwidth 120 GB/s
Shared memory - -
G-SYNC support +
DirectX 12 API 12 (12_1)
Shader Model 5.1 6.4
OpenGL 4.5 4.5
OpenCL 1.1 1.1
Vulkan 1.1.126 1.1.126
CUDA + +
CUDA cores 384 1280
Bus support PCI Express 2.0, PCI Express 3.0 PCI Express 3.0
SLI options +
HDMI + +
HDCP +
Maximum VGA resolution Up to 2048x1536
3D Blu-Ray +
Bitcoin / BTC (SHA256) 19 Mh/s 314 Mh/s
Laptop size medium sized large
DisplayPort Multimode (DP++) support +
H.264, VC1, MPEG2 1080p video decoder +
Optimus + +
GameStream +
GeForce ShadowPlay +
GPU Boost 2.0
GameWorks +
BatteryBoost +
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