GeForce 845M and GeForce GT 640 - video card comparison
Passmark - benchmark score GeForce 845M vs GeForce GT 640
GeForce 845M
1570
GeForce GT 640
1209
GeForce 845M
GeForce GT 640
Architecture
Maxwell (2014−2018)
Kepler (2012−2018)
GPU code name
GM108
GK107
Market segment
Laptop
Desktop
Release date
March 2014
June 2012
Interface
PCIe 3.0 x8
PCIe 3.0 x16
Supplementary power connectors
-
None
Boost clock speed
1150 MHz
-
Core clock speed
1071 MHz
902 MHz
Floating-point performance
883.7 gflops
692.7 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
1,870 million
1,270 million
Pipelines / CUDA cores
384
384
Power consumption (TDP)
45 Watt
65 Watt
Texture fill rate
37.63
28.86
Memory type
DDR3, GDDR5
DDR3
Maximum RAM amount
2 GB
2 GB
Memory bus width
64/128 Bit
128 Bit
Memory clock speed
2000 - 5000 MHz
1782 MHz
Memory bandwidth
40.1 GB/s
28.51 GB/s
Shared memory
-
-
Display Connectors
No outputs
1x DVI, 1x HDMI, 1x DisplayPort
HDMI
-
+
DirectX
12 (11_0)
12 (11_0)
CUDA
+
3.0
OpenCL
1.2
1.2
OpenGL
4.6
4.6
Shader Model
5.1
5.1
Vulkan
1.1.126
1.1.126
Optimus
+
-