GeForce GTX 660M and GeForce GT 640 - video card comparison
Passmark - benchmark score GeForce GTX 660M vs GeForce GT 640
GeForce GTX 660M
1478
GeForce GT 640
1210
GeForce GTX 660M
GeForce GT 640
Architecture
Kepler (2012−2018)
Kepler (2012−2018)
GPU code name
N13E-GE
GK107
Market segment
Laptop
Desktop
Release date
March 2012
June 2012
Bus support
PCI Express 2.0, PCI Express 3.0
-
Interface
MXM-B (3.0)
PCIe 3.0 x16
Supplementary power connectors
-
None
SLI options
+
-
Boost clock speed
950 MHz
-
Core clock speed
835 MHz
902 MHz
CUDA cores
384
-
Floating-point performance
729.6 gflops
692.7 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
1,270 million
1,270 million
Pipelines / CUDA cores
384
384
Power consumption (TDP)
50 Watt
65 Watt
Texture fill rate
30.4 billion/sec
28.86
Memory type
GDDR5
DDR3
Maximum RAM amount
2 GB
2 GB
Memory bus width
128bit
128 Bit
Memory clock speed
2000 MHz
1782 MHz
Memory bandwidth
64.0 GB/s
28.51 GB/s
Shared memory
-
-
Display Connectors
No outputs
1x DVI, 1x HDMI, 1x DisplayPort
HDMI
+
+
HDCP
+
-
Maximum VGA resolution
Up to 2048x1536
-
DirectX
12 API
12 (11_0)
CUDA
+
3.0
OpenCL
1.1
1.2
OpenGL
4.5
4.6
Shader Model
5.1
5.1
Vulkan
1.1.126
1.1.126
Optimus
+
-