GeForce GTX 660 and GeForce GT 640M LE - video card comparison
Passmark - benchmark score GeForce GTX 660 vs GeForce GT 640M LE
GeForce GTX 660
4119
GeForce GT 640M LE
720
GeForce GTX 660
GeForce GT 640M LE
Architecture
Kepler (2012−2018)
Fermi / Kepler (2012)
GPU code name
GK106
N13P-LP
Market segment
Desktop
Laptop
Release date
September 2012
March 2012
Bus support
PCI Express 3.0
PCI Express 2.0, PCI Express 3.0
Interface
PCIe 3.0 x16
PCIe 2.0 x16
Supplementary power connectors
One 6-pin
-
SLI options
+
-
Boost clock speed
1033 MHz
-
Core clock speed
980 MHz
Up to 500 MHz
CUDA cores
960
Up to 384
Floating-point performance
1,981 gflops
384.0 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
2,540 million
585 million
Pipelines / CUDA cores
960
384
Power consumption (TDP)
140 Watt
20 Watt
Texture fill rate
78.4 billion/sec
Up to 16.0 billion/sec
Memory type
GDDR5
DDR3\DDR5
Maximum RAM amount
2 GB
2 GB
Memory bus width
192-bit GDDR5
128bit
Memory clock speed
6.0 GB/s
1800 - 4000 MHz
Memory bandwidth
144.2 GB/s
Up to 28.8 GB/s
Shared memory
-
-
Display Connectors
One Dual Link DVI-I, One Dual Link DVI-D, One HDMI, One DisplayPort
No outputs
Multi monitor support
4 displays
-
HDMI
+
+
HDCP
+
+
Maximum VGA resolution
2048x1536
Up to 2048x1536
Audio input for HDMI
Internal
-
DirectX
12 (11_0)
12 API
CUDA
+
+
OpenCL
1.2
1.1
OpenGL
4.3
4.5
Shader Model
5.1
5.1
Vulkan
1.1.126
N/A
3D Blu-Ray
+
+
3D Gaming
+
-
3D Vision
+
-
Optimus
-
+