GeForce GTX 660M Mac Edition and Radeon R7 M270DX - video card comparison
GeForce GTX 660M Mac Edition
Radeon R7 M270DX
Architecture
Kepler (2012−2018)
GCN 3.0 (2014−2017)
GPU code name
GK107
Topaz
Market segment
Desktop
Desktop
Release date
April 2013
June 2014
Interface
MXM-B (3.0)
IGP
Supplementary power connectors
None
-
Boost clock speed
-
940 MHz
Core clock speed
950 MHz
900 MHz
Floating-point performance
729.6 gflops
-
Manufacturing process technology
28 nm
28 nm
Number of transistors
1,270 million
1,550 million
Pipelines / CUDA cores
384
384
Power consumption (TDP)
50 Watt
-
Texture fill rate
30.40
22.56
Memory type
GDDR5
System Shared
Maximum RAM amount
512 MB
System Shared
Memory bus width
128 Bit
System Shared
Memory clock speed
5000 MHz
System Shared
Memory bandwidth
80 GB/s
-
Display Connectors
No outputs
No outputs
DirectX
12 (11_0)
12 (12_0)
CUDA
3.0
-
OpenCL
1.2
2.0
OpenGL
4.6
4.6
Shader Model
5.1
6.3
Vulkan
1.1.126
1.2.131