GeForce GT 640M and GeForce GT 620 - video card comparison
Passmark - benchmark score GeForce GT 640M vs GeForce GT 620
GeForce GT 640M
946
GeForce GT 620
388
GeForce GT 640M
GeForce GT 620
Architecture
Kepler (2012−2018)
Fermi (2010−2014)
GPU code name
N13P-GS
GF108
Market segment
Laptop
Desktop
Release date
March 2012
May 2012
Bus support
PCI Express 2.0, PCI Express 3.0
PCI Express 2.0
Interface
PCIe 3.0 x16
PCIe 2.0 x16
Supplementary power connectors
-
None
Boost clock speed
645 MHz
-
Core clock speed
Up to 625 MHz
700 MHz
CUDA cores
384
96
Floating-point performance
480.0 gflops
268.8 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
49 Watt
Maximum GPU temperature
-
98 °C
Texture fill rate
Up to 20.0 billion/sec
11.2 billion/sec
Memory type
DDR3\GDDR5
DDR3
Maximum RAM amount
2 GB
1 GB
Memory bus width
128bit
64 Bit
Memory clock speed
1800 - 4000 MHz
1.8 GB/s
Memory bandwidth
Up to 64.0 GB/s
14.4 GB/s
Shared memory
-
-
Display Connectors
No outputs
Dual Link DVI-I, HDMI, VGA
Multi monitor support
-
+
HDMI
+
+
HDCP
+
+
Maximum VGA resolution
Up to 2048x1536
2048x1536
Audio input for HDMI
-
Internal
DirectX
12 API
12 (11_0)
CUDA
+
+
OpenCL
1.1
1.1
OpenGL
4.5
4.2
Shader Model
5.1
5.1
Vulkan
1.1.126
N/A
3D Blu-Ray
+
+
Optimus
+
-