GeForce GT 755M Mac Edition and GeForce GT 640M Mac Edition - video card comparison
GeForce GT 755M Mac Edition
GeForce GT 640M Mac Edition
Architecture
Kepler (2012−2018)
Kepler (2012−2018)
GPU code name
GK107
GK107
Market segment
Desktop
Desktop
Release date
November 2013
February 2013
Interface
PCIe 3.0 x16
PCIe 3.0 x16
Core clock speed
1085 MHz
745 MHz
Floating-point performance
833.3 gflops
572.2 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)
50 Watt
32 Watt
Texture fill rate
34.72
23.84
Memory type
GDDR5
GDDR5
Maximum RAM amount
1 GB
512 MB
Memory bus width
128 Bit
64 Bit
Memory clock speed
5000 MHz
5000 MHz
Memory bandwidth
80 GB/s
40 GB/s
Display Connectors
No outputs
No outputs
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