GeForce GTX 660 Ti and GeForce GT 640 - video card comparison
Passmark - benchmark score GeForce GTX 660 Ti vs GeForce GT 640
GeForce GTX 660 Ti
4547
GeForce GT 640
1209
GeForce GTX 660 Ti
GeForce GT 640
Architecture
Kepler (2012−2018)
Kepler (2012−2018)
GPU code name
GK104
GK107
Market segment
Desktop
Desktop
Release date
August 2012
June 2012
Bus support
PCI Express 3.0
-
Interface
PCIe 3.0 x16
PCIe 3.0 x16
Supplementary power connectors
Two 6-pin
None
SLI options
+
-
Boost clock speed
980 MHz
-
Core clock speed
915 MHz
902 MHz
CUDA cores
1344
-
Floating-point performance
2,459.5 gflops
692.7 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
3,540 million
1,270 million
Pipelines / CUDA cores
1344
384
Power consumption (TDP)
150 Watt
65 Watt
Texture fill rate
102.5 billion/sec
28.86
Memory type
GDDR5
DDR3
Maximum RAM amount
2 GB
2 GB
Memory bus width
192-bit GDDR5
128 Bit
Memory clock speed
6.0 GB/s
1782 MHz
Memory bandwidth
144.2 GB/s
28.51 GB/s
Shared memory
-
-
Display Connectors
One Dual Link DVI-I, One Dual Link DVI-D, One HDMI, One DisplayPort
1x DVI, 1x HDMI, 1x DisplayPort
Multi monitor support
4 displays
-
HDMI
+
+
HDCP
+
-
Maximum VGA resolution
2048x1536
-
Audio input for HDMI
Internal
-
DirectX
12 (11_0)
12 (11_0)
CUDA
+
3.0
OpenCL
1.2
1.2
OpenGL
4.3
4.6
Shader Model
5.1
5.1
Vulkan
1.1.126
1.1.126
3D Blu-Ray
+
-
3D Gaming
+
-
3D Vision
+
-