GeForce GTX 680MX and GeForce GT 640M - video card comparison
Passmark - benchmark score GeForce GTX 680MX vs GeForce GT 640M
GeForce GTX 680MX
4266
GeForce GT 640M
943
GeForce GTX 680MX
GeForce GT 640M
Architecture
Kepler (2012−2018)
Kepler (2012−2018)
GPU code name
-
N13P-GS
Market segment
Laptop
Laptop
Release date
October 2012
March 2012
Bus support
PCI Express 3.0
PCI Express 2.0, PCI Express 3.0
Interface
-
PCIe 3.0 x16
SLI options
+
-
Boost clock speed
-
645 MHz
Core clock speed
720 MHz
Up to 625 MHz
CUDA cores
1536
384
Floating-point performance
-
480.0 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
3540 Million
1,270 million
Pipelines / CUDA cores
1536
384
Power consumption (TDP)
122 Watt
32 Watt
Texture fill rate
92.2 billion/sec
Up to 20.0 billion/sec
Memory type
GDDR5
DDR3\GDDR5
Maximum RAM amount
2 GB
2 GB
Memory bus width
256 Bit
128bit
Memory clock speed
2500 MHz
1800 - 4000 MHz
Memory bandwidth
160 GB/s
Up to 64.0 GB/s
Shared memory
-
-
Display Connectors
-
No outputs
HDMI
-
+
HDCP
-
+
Maximum VGA resolution
-
Up to 2048x1536
DirectX
12 API
12 API
CUDA
+
+
OpenCL
1.1
1.1
OpenGL
4.5
4.5
Shader Model
-
5.1
Vulkan
-
1.1.126
3D Blu-Ray
-
+
3D Vision
+
-
Optimus
+
+