GeForce GTX 780M and GeForce GT 640 Rev. 2 - video card comparison
GeForce GTX 780M
GeForce GT 640 Rev. 2
Architecture
Kepler (2012−2018)
Kepler 2.0 (2013−2015)
GPU code name
N14E-GTX
GK208
Market segment
Laptop
Desktop
Release date
May 2013
May 2013
Bus support
PCI Express 3.0, PCI Express 2.0
-
Interface
MXM-B (3.0)
PCIe 2.0 x8
Supplementary power connectors
None
None
SLI options
+
-
Boost clock speed
797 MHz
-
Core clock speed
823 MHz
1046 MHz
CUDA cores
1536
-
Floating-point performance
2,448 gflops
803.3 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
3,540 million
915 million
Pipelines / CUDA cores
1536
384
Power consumption (TDP)
122 Watt
49 Watt
Texture fill rate
102.0
33.47
Memory type
GDDR5
GDDR5
Maximum RAM amount
4 GB
1 GB
Memory bus width
256 Bit
64 Bit
Memory clock speed
2500 MHz
5008 MHz
Memory bandwidth
160.0 GB/s
40.06 GB/s
Shared memory
-
-
Standard memory configuration
GDDR5
-
Display Connectors
No outputs
1x DVI, 1x HDMI, 1x VGA
eDP 1.2 signal support
Up to 3840x2160
-
LVDS signal support
Up to 1920x1200
-
VGA аnalog display support
Up to 2048x1536
-
DisplayPort Multimode (DP++) support
Up to 3840x2160
-
HDCP content protection
+
-
HDMI
+
+
7.1 channel HD audio on HDMI
+
-
DirectX
12 API
12 (11_0)
CUDA
+
3.5
OpenCL
1.1
1.2
OpenGL
4.5
4.6
Shader Model
5.1
5.1
Vulkan
1.1.126
1.1.126
3D Vision / 3DTV Play
+
-
Blu-Ray 3D Support
+
-
H.264, VC1, MPEG2 1080p video decoder
+
-
Optimus
+
-
TrueHD and DTS-HD audio bitstreaming
+
-