GeForce GT 640 and GeForce GT 755M Mac Edition - video card comparison
GeForce GT 640
GeForce GT 755M Mac Edition
Architecture
Kepler (2012−2018)
Kepler (2012−2018)
GPU code name
GK107
GK107
Market segment
Desktop
Desktop
Release date
June 2012
November 2013
Interface
PCIe 3.0 x16
PCIe 3.0 x16
Supplementary power connectors
None
-
Core clock speed
902 MHz
1085 MHz
Floating-point performance
692.7 gflops
833.3 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
50 Watt
Texture fill rate
28.86
34.72
Memory type
DDR3
GDDR5
Maximum RAM amount
2 GB
1 GB
Memory bus width
128 Bit
128 Bit
Memory clock speed
1782 MHz
5000 MHz
Memory bandwidth
28.51 GB/s
80 GB/s
Display Connectors
1x DVI, 1x HDMI, 1x DisplayPort
No outputs
HDMI
+
-
DirectX
12 (11_0)
12 (11_0)
CUDA
3.0
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