GeForce GTX 660M and GeForce GT 640M - video card comparison
Passmark - benchmark score GeForce GTX 660M vs GeForce GT 640M
GeForce GTX 660M
1478
GeForce GT 640M
946
GeForce GTX 660M
GeForce GT 640M
Architecture
Kepler (2012−2018)
Kepler (2012−2018)
GPU code name
N13E-GE
N13P-GS
Market segment
Laptop
Laptop
Release date
March 2012
March 2012
Bus support
PCI Express 2.0, PCI Express 3.0
PCI Express 2.0, PCI Express 3.0
Interface
MXM-B (3.0)
PCIe 3.0 x16
SLI options
+
-
Boost clock speed
950 MHz
645 MHz
Core clock speed
835 MHz
Up to 625 MHz
CUDA cores
384
384
Floating-point performance
729.6 gflops
480.0 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
32 Watt
Texture fill rate
30.4 billion/sec
Up to 20.0 billion/sec
Memory type
GDDR5
DDR3\GDDR5
Maximum RAM amount
2 GB
2 GB
Memory bus width
128bit
128bit
Memory clock speed
2000 MHz
1800 - 4000 MHz
Memory bandwidth
64.0 GB/s
Up to 64.0 GB/s
Shared memory
-
-
Display Connectors
No outputs
No outputs
HDMI
+
+
HDCP
+
+
Maximum VGA resolution
Up to 2048x1536
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
1.1.126
3D Blu-Ray
-
+
Optimus
+
+