GeForce 940M and GeForce GTX 645 OEM - video card comparison
GeForce 940M
GeForce GTX 645 OEM
Architecture
Maxwell (2014−2018)
Kepler (2012−2018)
GPU code name
N16S-GT-S/B
GK106
Market segment
Laptop
Desktop
Release date
March 2015
April 2013
Bus support
PCI Express 3.0
-
Interface
PCIe 3.0 x8
PCIe 3.0 x16
Supplementary power connectors
-
None
Boost clock speed
1176 MHz
-
Core clock speed
1072 MHz
824 MHz
Floating-point performance
903.2 gflops
949.2 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
1,870 million
2,540 million
Pipelines / CUDA cores
384
576
Power consumption (TDP)
75 Watt
65 Watt
Texture fill rate
28.22
39.55
Memory type
DDR3
GDDR5
Maximum RAM amount
4 GB
1 GB
Memory bus width
64 Bit
128 Bit
Memory clock speed
2000 MHz
4000 MHz
Memory bandwidth
14.4 GB/s
64 GB/s
Shared memory
-
-
Display Connectors
No outputs
1x DVI, 1x HDMI, 1x DisplayPort
HDMI
-
+
DirectX
12 (11_0)
12 (11_0)
CUDA
+
3.0
OpenCL
1.2
1.2
OpenGL
4.5
4.6
Shader Model
5.1
5.1
Vulkan
1.1.126
1.1.126
GameWorks
+
-
GPU Boost
2.0
-
Optimus
+
-