GeForce GTX 650 and GeForce GT 640 Rev. 2 - video card comparison
GeForce GTX 650
GeForce GT 640 Rev. 2
Architecture
Kepler (2012−2018)
Kepler 2.0 (2013−2015)
GPU code name
GK107
GK208
Market segment
Desktop
Desktop
Release date
September 2012
May 2013
Bus support
PCI Express 3.0
-
Interface
PCIe 3.0 x16
PCIe 2.0 x8
Supplementary power connectors
One 6-pin
None
Core clock speed
1058 MHz
1046 MHz
CUDA cores
384
-
Floating-point performance
812.5 gflops
803.3 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
1,270 million
915 million
Pipelines / CUDA cores
384
384
Power consumption (TDP)
64 Watt
49 Watt
Texture fill rate
33.9 billion/sec
33.47
Memory type
GDDR5
GDDR5
Maximum RAM amount
2 GB
1 GB
Memory bus width
128-bit GDDR5
64 Bit
Memory clock speed
5.0 GB/s
5008 MHz
Memory bandwidth
80.0 GB/s
40.06 GB/s
Display Connectors
One Dual Link DVI-I, One Dual Link DVI-D, One Mini HDMI
1x DVI, 1x HDMI, 1x VGA
Multi monitor support
4 displays
-
HDMI
+
+
HDCP
+
-
Maximum VGA resolution
2048x1536
-
Audio input for HDMI
Internal
-
DirectX
12 (11_0)
12 (11_0)
CUDA
+
3.5
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
+
-