GeForce 940MX and GeForce GT 640 OEM - video card comparison
GeForce 940MX
GeForce GT 640 OEM
Architecture
Maxwell (2014−2018)
Kepler (2012−2018)
GPU code name
N16S-GTR-B/S
GK107
Market segment
Laptop
Desktop
Release date
March 2016
April 2012
Bus support
PCI Express 3.0
-
Interface
PCIe 3.0 x8
PCIe 3.0 x16
Supplementary power connectors
None
None
Boost clock speed
1242 MHz
-
Core clock speed
1122 MHz
797 MHz
Floating-point performance
762.6 gflops
612.1 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
1,870 million
1,270 million
Pipelines / CUDA cores
384
384
Power consumption (TDP)
23 Watt
50 Watt
Texture fill rate
23.83
25.50
Memory type
DDR3, GDDR5
DDR3
Maximum RAM amount
4 GB
2 GB
Memory bus width
64 Bit
128 Bit
Memory clock speed
4000 MHz
1782 MHz
Memory bandwidth
40.1 GB/s
28.51 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
1.1.126
GameWorks
+
-
GPU Boost
2.0
-
Optimus
+
-