GeForce 940MX and GeForce GT 640M LE - video card comparison
Passmark - benchmark score GeForce 940MX vs GeForce GT 640M LE
GeForce 940MX
1561
GeForce GT 640M LE
720
GeForce 940MX
GeForce GT 640M LE
Architecture
Maxwell (2014−2018)
Fermi / Kepler (2012)
GPU code name
N16S-GTR-B/S
N13P-LP
Market segment
Laptop
Laptop
Release date
March 2016
March 2012
Bus support
PCI Express 3.0
PCI Express 2.0, PCI Express 3.0
Interface
PCIe 3.0 x8
PCIe 2.0 x16
Supplementary power connectors
None
-
Boost clock speed
1242 MHz
-
Core clock speed
1122 MHz
Up to 500 MHz
CUDA cores
-
Up to 384
Floating-point performance
762.6 gflops
384.0 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
1,870 million
585 million
Pipelines / CUDA cores
384
384
Power consumption (TDP)
23 Watt
20 Watt
Texture fill rate
23.83
Up to 16.0 billion/sec
Memory type
DDR3, GDDR5
DDR3\DDR5
Maximum RAM amount
4 GB
2 GB
Memory bus width
64 Bit
128bit
Memory clock speed
4000 MHz
1800 - 4000 MHz
Memory bandwidth
40.1 GB/s
Up to 28.8 GB/s
Shared memory
-
-
Display Connectors
No outputs
No outputs
HDMI
-
+
HDCP
-
+
Maximum VGA resolution
-
Up to 2048x1536
DirectX
12 (11_0)
12 API
CUDA
+
+
OpenCL
1.2
1.1
OpenGL
4.5
4.5
Shader Model
5.1
5.1
Vulkan
1.1
N/A
3D Blu-Ray
-
+
GameWorks
+
-
GPU Boost
2.0
-
Optimus
+
+