GeForce GT 640M and GeForce GT 620M - video card comparison
Passmark - benchmark score GeForce GT 640M vs GeForce GT 620M
GeForce GT 640M
943
GeForce GT 620M
447
GeForce GT 640M
GeForce GT 620M
Architecture
Kepler (2012−2018)
Fermi (2010−2014)
GPU code name
N13P-GS
N13P-GLP / N13M-GS
Market segment
Laptop
Laptop
Release date
March 2012
March 2012
Bus support
PCI Express 2.0, PCI Express 3.0
PCI Express 2.0
Interface
PCIe 3.0 x16
PCIe 2.0 x16
Boost clock speed
645 MHz
715 MHz
Core clock speed
Up to 625 MHz
Up to 625 MHz
CUDA cores
384
96
Floating-point performance
480.0 gflops
253.4 gflops
Manufacturing process technology
28 nm
40 nm
Number of transistors
1,270 million
585 million
Pipelines / CUDA cores
384
96
Power consumption (TDP)
32 Watt
15 Watt
Texture fill rate
Up to 20.0 billion/sec
Up to 10.0 billion/sec
Memory type
DDR3\GDDR5
DDR3
Maximum RAM amount
2 GB
1 GB
Memory bus width
128bit
Up to 128bit
Memory clock speed
1800 - 4000 MHz
1800 MHz
Memory bandwidth
Up to 64.0 GB/s
Up to 28.8 GB/s
Shared memory
-
-
Display Connectors
No outputs
No outputs
HDMI
+
+
HDCP
+
+
Maximum VGA resolution
Up to 2048x1536
Up to 2048x1536
DirectX
12 API
12 API
CUDA
+
+
OpenCL
1.1
1.1
OpenGL
4.5
4.5
Shader Model
5.1
5.1
Vulkan
1.1.126
N/A
3D Blu-Ray
+
+
Optimus
+
+