GeForce GTX 960 and GeForce GT 640 Rev. 2 - video card comparison
GeForce GTX 960
GeForce GT 640 Rev. 2
Architecture
Maxwell (2014−2018)
Kepler 2.0 (2013−2015)
GPU code name
GM206
GK208
Market segment
Desktop
Desktop
Release date
January 2015
May 2013
Bus support
PCI Express 3.0
-
Interface
PCIe 3.0 x16
PCIe 2.0 x8
Recommended system power (PSU)
400 Watt
-
Supplementary power connectors
1x 6-pins
None
SLI options
+
-
Boost clock speed
1178 MHz
-
Core clock speed
1127 MHz
1046 MHz
CUDA cores
1024
-
Floating-point performance
2,413 gflops
803.3 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
2,940 million
915 million
Pipelines / CUDA cores
1024
384
Power consumption (TDP)
120 Watt
49 Watt
Texture fill rate
72 billion/sec
33.47
Memory type
GDDR5
GDDR5
Maximum RAM amount
4 GB
1 GB
Memory bus width
128 Bit
64 Bit
Memory clock speed
7.0 GB/s
5008 MHz
Memory bandwidth
112 GB/s
40.06 GB/s
Shared memory
-
-
Display Connectors
Dual Link DVI-I, HDMI 2.0, 3x DisplayPort 1.2
1x DVI, 1x HDMI, 1x VGA
Multi monitor support
4 displays
-
HDMI
+
+
HDCP
+
-
Maximum VGA resolution
2048x1536
-
G-SYNC support
+
-
Audio input for HDMI
Internal
-
DirectX
12 (12_1)
12 (11_0)
CUDA
+
3.5
OpenCL
1.2
1.2
OpenGL
4.4
4.6
Shader Model
6.4
5.1
Vulkan
+
1.1.126
GameStream
+
-
GameWorks
+
-
GeForce ShadowPlay
+
-
GPU Boost
2.0
-