GeForce GT 640 and GeForce GT 420M - video card comparison
Passmark - benchmark score GeForce GT 640 vs GeForce GT 420M
GeForce GT 640
1210
GeForce GT 420M
417
GeForce GT 640
GeForce GT 420M
Architecture
Kepler (2012−2018)
Fermi (2010−2014)
GPU code name
GK107
N11P-GE
Market segment
Desktop
Laptop
Release date
June 2012
September 2010
Interface
PCIe 3.0 x16
PCIe 2.0 x16
Supplementary power connectors
None
-
Core clock speed
902 MHz
500 MHz
CUDA cores
-
96
Floating-point performance
692.7 gflops
192 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
23 Watt
Texture fill rate
28.86
6.0 billion/sec
Memory type
DDR3
(G)DDR3
Maximum RAM amount
2 GB
1 GB
Memory bus width
128 Bit
128 Bit
Memory clock speed
1782 MHz
800 MHz
Memory bandwidth
28.51 GB/s
25.6 GB/s
Shared memory
-
-
Display Connectors
1x DVI, 1x HDMI, 1x DisplayPort
No outputs
HDMI
+
-
DirectX
12 (11_0)
12 API
CUDA
3.0
+
OpenCL
1.2
1.1
OpenGL
4.6
4.5
Shader Model
5.1
5.1
Vulkan
1.1.126
N/A