GeForce GT 620 and GeForce GT 640 Rev. 2 - video card comparison
GeForce GT 620
GeForce GT 640 Rev. 2
Architecture
Fermi (2010−2014)
Kepler 2.0 (2013−2015)
GPU code name
GF108
GK208
Market segment
Desktop
Desktop
Release date
May 2012
May 2013
Bus support
PCI Express 2.0
-
Interface
PCIe 2.0 x16
PCIe 2.0 x8
Supplementary power connectors
None
None
Core clock speed
700 MHz
1046 MHz
CUDA cores
96
-
Floating-point performance
268.8 gflops
803.3 gflops
Manufacturing process technology
40 nm
28 nm
Number of transistors
585 million
915 million
Pipelines / CUDA cores
96
384
Power consumption (TDP)
49 Watt
49 Watt
Maximum GPU temperature
98 °C
-
Texture fill rate
11.2 billion/sec
33.47
Memory type
DDR3
GDDR5
Maximum RAM amount
1 GB
1 GB
Memory bus width
64 Bit
64 Bit
Memory clock speed
1.8 GB/s
5008 MHz
Memory bandwidth
14.4 GB/s
40.06 GB/s
Display Connectors
Dual Link DVI-I, HDMI, VGA
1x DVI, 1x HDMI, 1x VGA
Multi monitor support
+
-
HDMI
+
+
HDCP
+
-
Maximum VGA resolution
2048x1536
-
Audio input for HDMI
Internal
-
DirectX
12 (11_0)
12 (11_0)
CUDA
+
3.5
OpenCL
1.1
1.2
OpenGL
4.2
4.6
Shader Model
5.1
5.1
Vulkan
N/A
1.1.126
3D Blu-Ray
+
-