GeForce GT 640 and GeForce GT 645M - video card comparison
Passmark - benchmark score GeForce GT 640 vs GeForce GT 645M
GeForce GT 640
1209
GeForce GT 645M
957
GeForce GT 640
GeForce GT 645M
Architecture
Kepler (2012−2018)
Kepler (2012−2018)
GPU code name
GK107
N13P-GS
Market segment
Desktop
Laptop
Release date
June 2012
March 2012
Bus support
-
PCI Express 2.0, PCI Express 3.0
Interface
PCIe 3.0 x16
PCIe 3.0 x16
Supplementary power connectors
None
-
Core clock speed
902 MHz
Up to 710 MHz
CUDA cores
-
384
Floating-point performance
692.7 gflops
544.5 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
1,270 million
1,270 million
Pipelines / CUDA cores
384
384
Power consumption (TDP)
65 Watt
32 Watt
Texture fill rate
28.86
22.7 billion/sec
Memory type
DDR3
DDR3\GDDR5
Maximum RAM amount
2 GB
2 GB
Memory bus width
128 Bit
128bit
Memory clock speed
1782 MHz
1800 MHz
Memory bandwidth
28.51 GB/s
Up to 64.0 GB/s
Shared memory
-
-
Display Connectors
1x DVI, 1x HDMI, 1x DisplayPort
No outputs
HDMI
+
+
HDCP
-
+
Maximum VGA resolution
-
Up to 2048x1536
DirectX
12 (11_0)
12 API
CUDA
3.0
+
OpenCL
1.2
1.1
OpenGL
4.6
4.5
Shader Model
5.1
5.1
Vulkan
1.1.126
1.1.126
3D Blu-Ray
-
+
Optimus
-
+