GeForce GT 640 and GeForce GT 620 - video card comparison
Passmark - benchmark score GeForce GT 640 vs GeForce GT 620
GeForce GT 640
1210
GeForce GT 620
388
GeForce GT 640
GeForce GT 620
Architecture
Kepler (2012−2018)
Fermi (2010−2014)
GPU code name
GK107
GF108
Market segment
Desktop
Desktop
Release date
June 2012
May 2012
Bus support
-
PCI Express 2.0
Interface
PCIe 3.0 x16
PCIe 2.0 x16
Supplementary power connectors
None
None
Core clock speed
902 MHz
700 MHz
CUDA cores
-
96
Floating-point performance
692.7 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)
65 Watt
49 Watt
Maximum GPU temperature
-
98 °C
Texture fill rate
28.86
11.2 billion/sec
Memory type
DDR3
DDR3
Maximum RAM amount
2 GB
1 GB
Memory bus width
128 Bit
64 Bit
Memory clock speed
1782 MHz
1.8 GB/s
Memory bandwidth
28.51 GB/s
14.4 GB/s
Display Connectors
1x DVI, 1x HDMI, 1x DisplayPort
Dual Link DVI-I, HDMI, VGA
Multi monitor support
-
+
HDMI
+
+
HDCP
-
+
Maximum VGA resolution
-
2048x1536
Audio input for HDMI
-
Internal
DirectX
12 (11_0)
12 (11_0)
CUDA
3.0
+
OpenCL
1.2
1.1
OpenGL
4.6
4.2
Shader Model
5.1
5.1
Vulkan
1.1.126
N/A
3D Blu-Ray
-
+