GeForce GT 640M and GeForce GT 635 OEM - video card comparison
GeForce GT 640M
GeForce GT 635 OEM
Architecture
Kepler (2012−2018)
Kepler 2.0 (2013−2015)
GPU code name
N13P-GS
GK208
Market segment
Laptop
Desktop
Release date
March 2012
October 2013
Bus support
PCI Express 2.0, PCI Express 3.0
-
Interface
PCIe 3.0 x16
PCIe 3.0 x8
Supplementary power connectors
-
None
Boost clock speed
645 MHz
-
Core clock speed
Up to 625 MHz
967 MHz
CUDA cores
384
-
Floating-point performance
480.0 gflops
742.7 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
1,270 million
915 million
Pipelines / CUDA cores
384
384
Power consumption (TDP)
32 Watt
35 Watt
Texture fill rate
Up to 20.0 billion/sec
30.94
Memory type
DDR3\GDDR5
DDR3
Maximum RAM amount
2 GB
1 GB
Memory bus width
128bit
64 Bit
Memory clock speed
1800 - 4000 MHz
1800 MHz
Memory bandwidth
Up to 64.0 GB/s
14.4 GB/s
Shared memory
-
-
Display Connectors
No outputs
1x DVI, 1x HDMI, 1x VGA
HDMI
+
+
HDCP
+
-
Maximum VGA resolution
Up to 2048x1536
-
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 Blu-Ray
+
-
Optimus
+
-