GeForce GT 640M and GeForce GT 425M - video card comparison
Passmark - benchmark score GeForce GT 640M vs GeForce GT 425M
GeForce GT 640M
946
GeForce GT 425M
543
GeForce GT 640M
GeForce GT 425M
Architecture
Kepler (2012−2018)
Fermi (2010−2014)
GPU code name
N13P-GS
N11P-GS
Market segment
Laptop
Laptop
Release date
March 2012
August 2010
Bus support
PCI Express 2.0, PCI Express 3.0
-
Interface
PCIe 3.0 x16
PCIe 2.0 x16
Boost clock speed
645 MHz
-
Core clock speed
Up to 625 MHz
560 MHz
CUDA cores
384
96
Floating-point performance
480.0 gflops
215.04 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
23 Watt
Texture fill rate
Up to 20.0 billion/sec
6.7 billion/sec
Memory type
DDR3\GDDR5
DDR3
Maximum RAM amount
2 GB
1 GB
Memory bus width
128bit
128 Bit
Memory clock speed
1800 - 4000 MHz
800 MHz
Memory bandwidth
Up to 64.0 GB/s
25.6 GB/s
Shared memory
-
-
Display Connectors
No outputs
No outputs
HDMI
+
-
HDCP
+
-
Maximum VGA resolution
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
+
-